Why is it so hard for me to like someone?

I have only really really liked 3 girls and they didn't feel the same way.

It really frustrates me that it takes so long for me to like someone and when I finally do, I see my chances fade because she's either taken, I'm not her type, or I assume the worse and don't try

I don't know what to do anymore I hate how I am, I'm sick of it
Why is it so hard for me to like someone?
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