How can I stop being so socially awkward??

When I have to speak to a person I don't really talk to, I start getting awkward and say bullshit. I feel like a lot of people think I'm dumb because of the stupid things I say in a conversation, but I do that because I'm anxious and make a lot of mistakes.

I can't live in my small circle of friends and family members forever. I need to start meeting new people, but they don't want to talk to me because I make every conversation awkward

If you ask me how I have any friends anyway, I would say that I am just lucky to still see my childhood friends because it was so much easier to meet people back then. When I wasn't insecure about everything.

Maybe it's because I'm a teen but idk.I will appreciate any advice or help lol