I don't know the circumstances surrounding the break up of your other 4 projects but if this scenario looks familiar, there are some things you can try:
Potential Band Mate #1: "Hey, I hear you play drums. I play lead guitar. I've been thinking about forming a band. What do you think"?
You: "Good idea. I have some experience playing with other musicians".
Potential Band Mate #2: "I play Bass. You'll need that".
You: "If you're any good, you're on board".
Potential Band Mate #3: "I'm a vocalist and can play Rhythm guitar".
You: "Well I guess we can get started then. Now, what's our plan"?
Potential Band Mates 1,2 and 3: "??????. What's a plan"?
You get my drift. Perhaps you were more dedicated than the previous folks you played with and didn't discover that until after the fact. Frankly, I don't see how high school students could find the time to keep up their GPA, play sports, work a part-time job, spend any time with a "signifigant other" if that was in the picture AND find time to rehearse/jam/gig. I couldn't do it as I am particularly fond of sleep.
I would ask myself "Where do I really want to go with my music"? Then find like minded band mates. Look outside your school to slightly older musicians. Register with the following WebSites (they'r both free). Good Luck!
www.joinmyband.co.uk (Even though this is UK, you can select USA when you get to the Home Page)
www.BandMix.com (I think it's dotcom. Just put BandMix in your browser and see what comes up.)