I need advice with girls?

I'm almost 20 yo aand I'm single since the start of 2018, and I feel lonely; sometimes I feel very bad about it. Soo I think I have a problem with girls or they are the problem... or I think the problem is in the way I talk to them (girls I like), aand to be honest I'm very confused when i think about this , cuz I'm kind and I wanted to have a serious relationship. And all I have is nothing..
I need advice with girls?
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