24m and just need ways to improve

So I’m 24 m and a bit of background I have trouble talking, especially to people who I perceive to be “better than me” so at work it might be the boss or people with more skills, attractive women, or people with just more friends etc. but even everyone I fumble my words and want not, slump my shoulders and keep my head down when I walk past people and wonder if they are thinking about me, relive conversations if they go bad. I used to be out there and loud in high school when I took Zoloft but I stopped and a few months after that had a bad interaction and just kept my mouth shut and lost all confidence. I just looking for ways to help get out of my shell and move forward to being at least what I thought was the funny guy who everyone loved to be around and wasn’t afraid of other opinions of me