18 [F4A] Maine Feeling guilty post-hookup after a breakup

So I recently got out of a long relationship with my boyfriend where he was all of my firsts. I just started college recently and my friends knew about this so they got a guy to come meet me and one thing led to another and i did kind of end up hooking up with him and going all the way with him and it feels weird now since like I totally let a guy who isn't my boyfriend do those things to me and idk if it's normal or not!!