So my boyfriend told me how many girls he's slept with (keep in mind that he was my first for everything) and for some reason I just feel weird towards him now.. Like I'm sad and angry at the fact I wasn't those girls .. I mean am I the only one like that is it normal to be upset about it?

Regardless of that, it is normal to feel that way.
Sometimes it's best not to ask and not to tell.
I'm married more than 20 years and I've never even asked my hubby who he dated, never mind slept with.