Kinda personal, but I'm really stuck here...?

Oi, ok. Well, i lost my virginity when i was very young, and so i grew up very fast. But now im with a new guy, who is AMAZING. He is the first guy to notice everything about me and really understand me. Yet, in doing this, he has found that after we have , im depressed the next day. And i think i am like this because to me is slutty, becasue i did it so young, i never mentally prepared for it and my brain can't understand what im doing. Yet, my body knows quite well. And he has promised me we wouldnt have for a month or until i knew i was menatlly ready. But i feel bad, because we have had , and i feel like im taking it away. So, i am trying to get over what ever is wrong with me, but im not sure how. Any advice?