I joined Tinder

Ok so I joined tinder just to meet new people, grow socially, and go on small dates. Well, the first issue is that I'm actually only 17 and a junior in highschool. Some guys I confess this to and it's usually chill but I didn't with this one guy who is 19. I told him I graduated highschool last year and am now taking a gap year. Well I ended up at a his frat for a party last night and just feel conflicted. He invited me to another one tonight. I don't know what the hell I am doing? Should I confess I'm only 17 or at least the fact that I am in highschool? Or should I keep playing my game and just flee when it's gets fucked up? Also I'm pretty sure the age of consent in Illinois is 18 too and I don't really care for the government involving itself in my personal life anyways, so what if things get physical? Cause personally I don't care