I'm a 28 year old male. Up until now I have had periods where women have really only been there to satisfy my own ego and my sexual desires. I've been worried that I don't have the capacity to fall in love or sustain a lasting emotional attachment to a woman.
But, then you meet the right girl, and BANG. You're in loved. All of a sudden, you couldn't think of anything worse than trawling bars just to get your end in. After a while though, a guy will often tire of the relationship and go back to the earlier cycle of shallow, sexually-focused interactions with as many reasonably attractive women as possible. You'll forget that feeling you had with the girl before. You'll probably remember only the bad parts: the boredom, the feeling of being caged in. Then, BANG again, you meet another girl, and she's fantastic, and all of a sudden you only care about her. etc, etc.
As I've matured through my 20s I definitely feel like my capacity for long-lasting relationships has also strengthened. In my early 20s, I probably felt a lot like you do now. So in short, don't worry about it. Just do what you have to do now.
Is it burnin'? Well, f-ck, now you're learnin'.