anxiety

i have had these feelings for years and years on end . i can’t stop thinking about everything , and the emotions are too much . for example, i would be anxious and scared to go out with friends or anywhere myself , my self esteem is very low and i have self harmed a bit with sharp plastic ruler which do hurt quite a bit. i haven’t gotten to a very bad extent but i really suspect that i have maybe anxiety , i’m not sure of anything anymore , i must have a plan for everyrhinf