hi !! so im sofia im 14 and i think i have social anxiety and i dont know what to do

so all my life i've been a shy person and only kinda let myself go with people that im really close with, but recently i have realized that im not only shy but i get really anxious whenever i have to talk to people and stuff ??? like i cant even tell my friends or my parents thing beacuse it just scares me and its so frustrating ugh and whenever i actually participate in a conversation and try to speak i just kinda rethink everything after and it could be months and ill still be thinking about something i said and think about how stupid i was. also like,,, i feel like im not being able to do like ,,, normal things people do and isksksksk idk i hate this feeling that i get and seeing people having fun and stuff and i just cant ??? bc im too scared idk ugh so i really wanna get help.

i want to stop living like this u know, im tired. but i dont know how to tell my parents or somone like it scares the heck outta me. and heck like i dont even know if this is social anxiety or if its worth to se a therapist or what should i do didnwijdwk idk i just wanna feel like everyone and make friends and be able to talk and go out with my actual friend u know ??? agh

pls someone give me advice ): sorry for my shitty grammar and stuff