[Tigereyes]

In most places, you do have to be 18 before you can go to the doctor by yourself. However, by around 16 or 17, they usually start giving you the option of having your parent step out of the room during part of the time. When I went to my appointment at 17, they told my mom she had to leave the room. If they don't give you that option, I'm sure you could ask to speak to the doctor alone for a while. It is possible that they would have to tell your mom about self harm because you're in danger to yourself so I would try to find out before you go if they're required to tell so that you know what to expect. If they do tell your mom though, the doctor would certainly make sure she understood.