I really need to get over my socail anxiety . its killing me?

okay soo, i think ive had socail anxiety my whole lifee. iw ould act very starnge around people and get really nervouss. but now pover the years i feel like its getting worstt. im going crazyy.. my friend wants me to go to the beach tonight to meet up with a bunch of our friends but i cant.. i just get this really bad gut feeling efore going out anywhere.. i dont like talkign too people cuz i feel really stupid and i send off bad vibess. everytime someone sits next too me i send off a wierd vibe and they movee. just today i was shopping and these 2 lil girls gave me the wieredet faces adn kept staring at me?? i hateed it. i felt soo stupid and idkk.. please help me. much love<3 and no stupid answers. best answers will receive 5 star