How do i make friends outside of school, no job?

I used to feel okay in being alone a lot because i knew i still had people who cared about me. Now im not so sure… i just feel so lonely now and look like such a loser. I’m 18 with no job and live at home. I really want to make friends that will hang out with me but i just don’t know how to expose myself to new people to do this! I’m becoming so anxious and i don’t want to lose myself.😓

I live in London so it feels like it should be easy.