This must suck. I, too, have a very loud voice, which everyone feels like they have to comment about. It sucks. My teachers make fun of me too. I know that this must sound stupid to you, because I have a much smaller problem as compared to yours. But still, I hate how I sound and I get annoyed by my own voice.
Anyway, I think that the best thing to do in this case is to just accept it, or try to be with people who would accept you and make you feel good. I know that what I'm saying sounds useless, but I think that it is important to be confident and to accept your own self. The other thing that I would totally recommend and that I would have definitely done if I were you is to actually meet up with a voice coach. From what see, I can tell that this problem is affecting you personally, so I would definitely recommend a voice coach! I have a cousin who had a very weird lisp (she pronounced K as T.) Her mum gave the issue an ice-cold shoulder. My cousin is 21 now. No coaching would be effective to her. It is difficult for her to meet new people or to get into relationships (actually impossible.) So, I would definitely advise you to see someone before it's too late. This is not a small issue if it's going to be long-term. Especially that it makes you feel that uncomfortable and insecure. Manage your time and definitely see a coach.
Feel good, you have nothing to feel bad about. Good Luck!