I haven't had any interaction to any girl in 3 years. How do I start over again?

I was dumped before and healed from it but now i am realising that I haven't talked to girl in around 3 years and mostly guys are my friend. I have become weirdly anti social and so much self conscious around people specially girls. and i feel like i don't understand people. Any help/advice will be appreciated.
I haven't had any interaction to any girl in 3 years. How do I start over again?
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