How can I sing high notes without using vibrato?

Question:

How can I sing high notes without using vibrato?

I can not sing high notes without using natural vibrato. It sounds good, but I'm 13 and it really stands out in a middle school choir. It's really embarising because I have a full sound aposed to the other girl's rather wimpy and I naturally stand out from the rest of the choir. I've been hiding my high notes from the teacher so no one can hear my vibrato. I really would like to sing comtrobly in front of a group and in a choir, but the only way I can do that is sing high notes without vibrato, but I cannot without my voice falling out.

Best Answer - Chosen by Asker: practice breath control.....the more you can control the power in your voice the more you won't stand out it's a good thing that you have a nice voice but in a choir you need to blend in and might i suggest getting a voice coach or better yet just ask your teacher he/she will be able to hepl besides that's what they're there for!