How do i get out of my shell

How do i actually go and talk to someone and make friends, all the friends i have have talked to me first, and im on my final year of high school and i feel like ive wasted so many opportunities to make new friends. Im really awkward and get nervous in social situations and i always have some sort of anxiety that people wont like me if i say hi to them or talk, i just want to know anything about how to talk to new people and make friends