[Mahray]

Originally Posted by Terabithia.

And maybe as far as using TH, if I do, I can say something like "I volunteer with a not-for-profit organization, where I assist young adults with a range of issues going on in their lives (if someone could help me rephrase that, it'd be loverly)" and then state what I learned?

I volunteer for a not-for-profit organisation. (Or organization, if you want to ruin the English language :P) My role is to assist other young adults who are having difficulties coping with a range of issues. I have been involved with this organisation for <18 million years>.

That look ok? Basically - keeping to nice short sentences. To the point. No flowery words.

Your plan looks good in outline. Focus on what you will do, not what you might run into in terms of trouble.

I'm sure that once you've written the essay, peeps on here will be happy to help proofread it as well

As for mental health... interesting. You could mention that you have overcome some personal challenges around anxiety and not talk about it much?