How can I be more social?

I’m 23F, college student, Latina. I’m really friendly and easy to be taken advantage of and honestly I’m just tired of not being able to be social for my age. Basically what I’m really trying to say is I lack social skills because I feel like I act under pressure. I’m such a people pleaser and I don’t know how to act when people get upset/mad or just a bad vibe. I laugh at everything, I’m always smiling and honestly I don’t know what type of trauma I have (because I smoke a lot of weed and I honestly forgot most of my childhood between ages 14-17) I mean I didn’t forget but it’s just a blur, I’m past those ages and times you know? I was just struggling with family issues and I picked up a blunt at 18 and been smoking since so I feel like it definitely took a cause on that. Anyways, yeah I say sorry for every little inconvenience and I know I need to change that but I work in retail as a cashier and atleast 5 customers a shift tell me “stop being so sorry” lmaooo like damn I’m sorry. I’m from a small state (MA) so I don’t really go out much. I’m not the outside type of person like I really do wish I can just sit at the bar and conversate with folks because I really do love a good convo! But it’s hard.