I let people get to me.

[ac2]

Basically, that's my issue. I let people and situations get to me too much. I always have. People tell me to just ignore it and let the issue just roll off my back. Okay, I can ignore it no problem, but it's the letting go I can't do. Sometimes I can ignore something that happened, and months later I'll be thinking back and saying, "I should have said this" or "I should have done that." Then I just start to beat myself up more and frustration and depression ensue.
Most recently though, something--well actually more of someONE--has gotten to me so bad, that I didn't go into work today. I knew I would be forced to be working directly with them, and the thought of that made me so anxious to the point I was physically sick and called in.
Some background:
When I first started this job, this person and I got along well. We talked pleasantly during work and I could approach her with any work-related questions I had with no issue. Then, a couple of months ago, she just stopped talking to me.
At first, I just thought maybe she had something going on at home or it was just the stress of her training to become a team lead. But since then it's become nothing but worse. She won't come to talk to me about something unless she's frustrated at me. And when I try to ask her about tasks for the day (because she makes up the list), she's very snobby with me and makes snide remarks at me. For awhile I just ignored like people instructed me to, but the past few weeks I just couldn't ignore it anymore.
One day she made a comment at me and I finally was just so frustrated I broke down crying. I went and talked to my HR about it, and she basically told me this is something I need to discuss with her myself. Well sure, this wouldn't be an issue, except one of my other major flaws is I'm VERY non-confrontational. I was suggested to talk about this with her two weeks ago, and I still haven't done it (not that my HR has checked up on it or anything).
The worst part about it, though, is aside from a couple people who work night-side, nearly everyone at my work loves this girl. Even the managers think she's awesome. And, now, don't get me wrong, she is an awesome worker and I respect her for that. However, her attitude towards some team members is horrid. She is so unpleasant for me to be around, that this morning as I was getting ready for work I became so anxious from the expected discomfort of being around her today that I got physically sick and had to call in.
I know that's ridiculous. Before my boyfriend left for work he tried talking to me about it (not in a mean way or rude way--he was going for honest but comforting), and I broke down crying, and essentially have been crying about it for almost 3 hours now.
I feel HORRIBLY guilty about calling in, especially since this is my last week at this store. I had every intention of not missing a single day this week. Now, though, I have to hope that my attending work for the rest of the days I'm scheduled this week can make up for it enough that I'm not given a piss-poor review from them when I leave.
I just feel so silly and stupid. Why can't I just let it go? I'm so damned sensitive about anything really that happens to me in life. I feel so depressed, really. What makes it worse is that I have people to talk to, and I do talk to them, and I still feel incredibly alone. I'm so upset and angry at things outside of my family/friends and home life. I talk about it, but the frustration still seems to just bottle up inside me.

Seriously, how can I learn to just let things go?

[OMFG!You'reActuallySmart!]

Some may disagree with what I say but don't bottle it up, let all the frustration and anger out. Don't do it on any living person or animal. For example, use a punching bag, scream your lungs out into a pillow, etc... until you feel you've gotten all the frustration out.

As for being very sensitive about the verbal stuff to the point of crying, I don't have any person experience with that. I've had people tell me off whether I deserved it or because I was doing what I had to but they had a terrible day(s) not due to me. I think breaking down into tears like that reflects some insecurity, lowered self-esteem and trouble properly functioning in stressful interactions. One possible way (which you probably won't like and understandably so) is to face more of it with the hope of becoming less sensitive to it.

I think if you get some more confidence through your efforts in the workplace, then it can serve as a buffer for the hurtful stressful comments by the particular person. Such as getting positive comments and rewards, or increasing your social interactions and friendships with people at your workplace. Doing this outside the workplace is beneficial as well but especially within the workplace. This may also be able to help you out in being more willing to confront her, however, if you're still uncomfortable, take someone with you who will act only to make you feel better but not be responsible for confronting the person.

You ask how can you let things go, be less sensitive and able to be more confrontational. I ask the opposite because whenever I've gotten a job, I often pick ones that are more stressful as opposed to boring as I do very well in stressful environments. If it's not stressful, I'll probably get bored and find something to do. I have no problem confronting others as I don't get stressed doing it. Several times I've gone with friends who had to confront someone but were in your shoes of being very non-confrontational and pretty sensitive. I let them confront the person and just hung back unless my friend started breaking down, which is when I stepped in via non-violent nature and tried to simmer things down, then re-address the issues.

I've gotten pissed off to the point of wanting to throw something but usually when others are angry, I'm fine, don't feel angry nor stressed. When I do feel angry or stressed, others have already lost their mind. I've been calm as a child, apparently never cried as a baby and never any social problems.