Are we too harsh on ourselves?

Hey, I was feeling a little down lately and just thought "am I too harsh with myself"? I'm 18 and have had zero girlfriends in my lifetime. This lead me to think I'm way too unattractive to have a girlfriend. However, I have been called attractive several times (sometimes by guys too) but when I look in the mirror I just don't see it and end up feeling down again. Anyone else like this? What can I.do?

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