I need to work on being a more social person I'm at a low point of my life (no Hate please)

I need help trying to be more social and more happy about my life it's hard to explain looking at other post and other parts of the internet I feel like it's pushing hate about being lonely and me having a bit of that hatred I really trying to ignore that anyway I've had bad experiences in the past where now it feel hard to approach people and my deminor or vibe pushes people away I look sad all the time when I'm just tired I love talking to people have funny conversations but I feel like maybe i don't put effort to start them or something. I need to change my attitude I've been alone all my youth and thinking ill make friends in college and i'm in summer of junior year I have no confidence or self love.

this has kinda been a rant but I want to ask how to manfully talk to people and look more approachable or approach people In my class and for the people who do approch me I wanna keep relations with them like this one amazing guy talks to me I don't know what to say to continue talking or this girl in my class she's sweet but I don't know what to talk about with here or like it will feel aqward I dont know.