Yea bro I'm a junior in high school. Pretty much my whole time in high school I bought from people in my school, pretty much similiar to your situation. But around last year I started meeting some people that are out of high school that were willing to sell to me. Usual older cousins or older siblings of my friends, worked out pretty well cause I actually started buying good shit. Could also have to do with your area, if theres good shit going around chances are you're gonna get some no matter who you buy from.