Why can't I can fully attracted to a guy that I am only a little bit attracted?

I am bit attracted to one but is not like a huge attraction. I had a problem with getting attracted to guys. Yet now it seems to be a bit of problems. I am not sure what to and how I might need to rethink about my feelings. They are not strong but I think they have feelings for me. What should I do. I am very unsure about it. I find it very hard to talk and get to know each other. .
Why can't I can fully attracted to a guy that I am only a little bit attracted?
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