Ask Lilz!

My boyfriend and I have been together for 8 months now 9 on October 14th. He's 18 and I'm 16, we clicked the instant we met, only thing was he was a bit of a flirt. I've know him for about two years now, we'd flirt around and what not but I never took him seriously because of all the other females that were after him. He said he'd give up his flirtatious ways if I agreed to be his girlfriend. So I did, I liked him a great deal.
We "fell in love," or I did atleast. Everything was going well, we ended up having sex 5 months after we started going out, I sortah regret it he was my first.
Anyways, we've been having small problems. Well I think he thinks everything's ok, but he doesn't call me much. I'm always the one to call, usually.
At night, after 9 when he has free minutes. :/
Anyways, sometimes he acts as if I bore him, or he doesn't like me or love me...he gets annoyed and irritated with me for no apparent reason.
I want to know, does anyone think he's with me just 'cause of sex?
I mean he lives in chicago and I live in Aurora, he sees me once a week or so, we talk every night usually.
When we're together he seems to push onto sex fairly quickly.
I don't know what to do most of the time, I want to make him happy so I go through with it most of the time, we use protection of course.
But afterward I sortah feel sad, I feel kindda upset with myself, not sure why. Has this happened to anyone else?
I kinda get the feeling that's all he wants, but I do think he loves me, or did atleast at one point, but lately I been feeling as if he only likes the sex.
What should I do?
Am I wasting my time?
I love him alot, but (is this wrong?) love me more, and I've been hurt many times before and don't want to get hurt in the end.
He began to change since he recently started college...I don't know, could he be stressed?
Any help would be useful thanks. :T

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