The opposite of a social butterfly

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tl:dr advice to someone who doesnt know how to hold a conversation

I love meeting new people, but the problem i have is that when i approach someone new i have zero clue what to say. sure "hey im so and so hows it goin" thing works, but it only takes you so far. i'm definitely socially awkward. I have no problem whatsoever walking up to a perfect 10 in a bar setting, but i just dont know what to say, and how to keep a conversation going. getting blown off, is not a fear for me.
I'm usually the one that, in a group of people, that just sits quietly and listens, not really adding much to a conversation. and the problem is, i LOVE talking to people, i'm a server and i enjoy talking to my tables. yet, doing that is easy, i NEED to talk to them, and i have a mental script of what im going to say usually. but in a public setting i dont have anything to go off of and i freeze.
I have zero actual friends, i havent dated anyone for five years. i want to get out of this bubble im in, and im trying, so hard to do it. i go out constantly but all i ever do is walk around bars like a creeper because i cant think of anything to say to anyone. if i see someone i know i usually hang onto them like a lost puppy until they find an opportunity to ditch me. yes im a gamer, yes im a bit of a weeb, but i've always been told im a good looking guy, not a bodybuilder at all, but i know i look decent and i actually make an effort.