Is it normal i'm feeling this way about him?

I don't know how to go about this, but, back in the first year of high school, I met this boy. Automatically, I thought he wanted nothing to do with me because I wasn't his "type", so I didn't bother to put myself out there. So, two, maybe three years later -- after experiencing things with different people, and watching him get any girl he wanted, I thought it would be easier to just forget about getting a chance with him. I've always been attracted to him, but I thought to just get over it. But suddenly, we started to talk a few years down the line. We found out we had a lot of things in common. He even told me secrets, like the fact he had a crush on me the first year of high school but was too nervous to confront me, so he did nothing about it. He also told me he was very attracted to me, and obviously, I grew excited and hopeful. So, speeding up... we started to hang out in person, more and more. We're always so happy when we're with each other. He even took my virginity a few days ago. It was a great experience. Only, we're not dating. I think we're both just trying to figure out if we really want to be together. I mean, even his friends told me that he liked me a lot even though he won't admit to it. I know this guy and I are going to hit it off more and more. But the main thing, the reason I'm writing this, is because I'm worried about myself. I'm not acting the same, I'm not feeling the same. When I'm not with him, I feel sick to my stomach. I worry about what he's doing, if he's okay, who he's with. I always talk about him, and if I'm not talking about him to someone, I get in a crabby mood and become extremely upset. So, I was just wondering if any of you knew what this was... and if you think it's normal? I seriously think I'm becoming unhealthily obsessed with him and I feel obligated to be with him all the time or else I grow insane. I don't want to freak him out and possibly jeopardize what has been the best thing that's ever happened to me.