hi. can anyone give me some advice?

i recently realized its automatic and i am usually nervous to follow up with people. i feel like im on the outside. I was homeschooled and i hated that. sheltered from everything and then some

i guess im too sincere?, unapologetically talkative, maybe im too idealistic. idk i wish i would shut my mouth sometimes but i never know when something embarrassing si going to come out. and im going to talk about science biology, or alienate people by being a know it all. . i kind of get that sometimes. people look at me like im crazy. especially girls. for talking so much. i hate being a know-it-all and i hate coming off so full of myself. i dont mean to. gah its never my intention. but its lik EVERY little subtle thing is wrong. im too honest or innocent, or smart or whatever

but i am putting myself out there, I just cant get close to people. wtf.. i feel like its pointlesss actually. I really hate everything about his stage of my life. im angry. i want to live. I just want to come out of my shell and be normal. Can anyone give me advice?

i am going to college in like 2 years.
what do you think i do wrong? i dont want to be avoidant anymore.

Thank you