Relationships

Why does it feel like every time I like a boy and they finally like me back, I feel so disgusted all of the sudden? Its not even their fault, I just feel like I don't want this anymore and that I'll regret it. I love being single but it really hits me in the middle of the night when I dont have someone to really talk to about anything. Whenever I get into a relationship, I feel like I need days upon end alone sometimes and that's usually the issue. I always date a guy who is pushy, clingy, etc. and I cant stand it. But who's gonna wanna date someone who just wants to be alone for so long sometimes? Help a girl out pls