Heh, don't stress about that man... I'm 18 and I ain't even seriously thought about relationships yet, they aren't everything ya'know?
Regrets or no, just remember that life can be anything you want. If one thing hasn't worked yet, find something else for the time being, and the rest may come to you far in the future, you don't need to race through life to get just any goal, just enjoy it until you happen upon it, and maybe you'll find other things that you want along the way.