I know excatly what you are talking about, completly. Nothing is wrong with you, I went through this when I was in jr. High. Like I would get into a guy, and what not, and flirt with them, until they just had to look my way, and lure them into me, and once I got them and they told me they liked me or wanted to date me whatever, id feel like yuck, and be totally un instrested anymore, itd just happen like that! So weeeird! I hated it, because it made me feel bad, like I just wanted to like someone have have them like me back, but for it stay like that! Luckily it was just a phase and I got over it, I dont know how but I just grew out of it, just trying to tell you on what I remember because jr. High was a while ago, haha. But don't worry! Not sure how old you are, but you'll most likely mature out of it : )