Worried about my Sexual Orientation?

Hi ladies, I just wanna say that this forum seems so helpful and I have seen a few topics similar to mine, but I would really like input from all the really helpful people here!

So I'm almost 18. And I'm really worried about my sexuality. It's probably irrational, I have had so many talks with my mom to the point where I'm asking her to reassure me pretty much everyday. But let me just say that in my real every day life, I've only ever liked guys. I'm so crazy about them, so attracted to them and all my life I've dreamed of marrying a guy. I have no doubts about that, and I've never in my life thought I've wanted to be with a girl, or have a relationship with them or marry them. It's never crossed my mind.

But ever since I hit puberty I have had a worry in the back of my mind that has come to the forefront in a big way. Flat out, I am aroused by images of womens bodies (breasts, etc) or lesbian scenes/fantasies. But thing is, I have never thought about a REAL girl that way, and my sexual fantasies of girls arent really any intense sexual activity. But either way they do arouse me. And since growing up I didnt have alot of education on sexual orientation, so I just assumed and feared that I was bisexual or a lesbian for it. I have looked at a girl and thought shes gorgeous and thought "Oh god, am I gay?". So I guess I've had this fear for a long time; and every time I heard talks about lesbians or gay stuff or anything I felt this fear act up in my head, because I thought "What if thats me????"

But girls dont turn me on in real life, and boys make me very very hot. I have always been so set on finding my soul mate (who I had always dreamed would be a guy). What fuels this fear is I'm scared I'll be a lesbian and wont be able to have my dream guy or my wedding, or that I'll get married and I'll have to fantasize about women because sex with my husband wont be good (I'm a virgin) or I'm scared that I'll fall in love with a girl. I really dont want to be with a girl.

This fear is getting so obsessional, I fear it so much and cry about it so much and try to search for answers, and I'm scared that because I was confused growing up that must mean something about my sexuality.

Can someone help me or give opinions??? Thanks.