I don't know how to hold a conversation, how can I learn?

I've always been shy and never good at talking. I was also diagnosed with social anxiety at 12. Now I'm 20 and I still cannot talk to anyone. My mind just goes blank, I have no idea what other people just casually talk about. I was in a club recently alone, a girl came up to me and asked me to join her and her friends and I did. She was so nice to me and basically saved my night, was talking to me and all but she always had to lead the conversation because I have no idea how to do that. I have nothing to talk about. I don't know anything I'm actually socially inept

How can I fix this please I'm so tired of myself

I don't know how to hold a conversation, how can I learn?
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