You certainly aren't alone. The first time I attempted suicide (thankfully rather incompetently) was the night before 6th grade started because I didn't want to deal with those people.

I was terrified of being put on drugs in high school... but don't let that fear let you fall into more harm. And it isn't drugs that will solve things; there are individual and group therapy methods that are important and sometimes offered for free by local NAMI groups. Also, maybe try to find groups outside of school that you can control your exposure to.

As practical advice... insurance and family are the two things that have kept me from living on the street. My psych bills - just co-pays - are about half of what I earn. If you wait too long and fall off your parent's policy, it will be hard getting back on regular treatment.