Guys, don't settle into a long term relationship with the first girl that's willing to sleep with you on a regular basis. Willingness to go all the way does not a good girlfriend make. You are in an incredibly unique situation while in high school. No one takes your "puppy love" relationship seriously so why should you. Only 1 to 2% of high school relationships end in marriage. So stop worrying and just have fun. In fact, new rule, you need to put at the most a 6 month expiration date on any relationship you start. That means you can date a minimum of 2 girls a year, so therefor 8 girls throughout your high school career. And again thats the minmum, I'd go as far as moving on after 3 months. that'll give you 4 girls a year and 12 girls throughout high school... Now doesnt that sound much better.
Believe me, you'll look back and thank me one day.