Just to clarify,
dating someone underage isn't illegal (to the best of my knowledge). However,
having sex with them may be, depending on their age and other circumstances (such as crossing state lines with them). There are other illegal things, too, like supplying alcohol to a minor.
@anushreesparkling <span style='font-size:15px';>, are you saying you're a sophomore in high school? What year of college is this guy in? And how long have you been meeting random guys online--you said that you met him 'like any other' but he turned out to be older than you. If you're a sophomore in high school, I'm curious as to how/why you've had so much experience meeting strangers online.</span>
<span style='font-size:15px';>Do you actually </span>
<span style='font-size:15px';>know</span><span style='font-size:15px';> his age? Do you have any proof of his age and where he's attending college? Like a student ID card? Are your parents aware of this relationship?</span>