Should I tell hookup Im a virgin?

No. In fact, some experts say there may be no way to tell if a woman is a virgin, even with gynecological tests. However, there is a chance you could bleed your first time (although many women dont), and there is a chance you could experience some pain your first time (again, some dont).

Is it weird to be 20 and a virgin?

And people younger than 20 are reporting fewer instances of first-time sexual intercourse than in previous generations. So scientifically speaking, being a virgin once you hit 20 is pretty damn normal for the men and women of my generation. VIRGINS!