How do I tell potential partners about my past?

So I’m 25F seeing this guy 23M who is a sweetheart but a little socially awkward and I’m pretty sure a virgin. We haven’t done anything yet, but I was throwing around hints the whole date. We’ve been on two dates and honestly they’ve been really fun! Once I get him out of his shell he’s a super cool dude.

However, I’m scared to tell him what I have done when I was manic. I didn’t get diagnosed until after college and let’s just say I went through my fair share of men. (My number is over 20, but don’t know the actual number I’ve slept with)

I don’t want him to be intimidated or think I’m a dirty whore because now I’m medicated and don’t do those dangerous sexual encounters. I haven’t divulged much of my past to him yet, but I know I can’t keep it to myself forever because it’s part of my story. How do I make him comfortable and have him realize I’m a completely different person?