How do i even get out of this type of mentality

When I was younger I was the fat kid around ~13, but now i'm older and lost some weight girls actually take interest in me, but it's hard to accept that they actually find me attractive, I get paranoid and just think it's a joke they're playing with their friends and it's horrible and I get defensive and don't dare talk to them or anything incase im making myself look like a fool, HOW DO I MAKE IT STOP, ROBOTS :confused:

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