How do I be single

I am 22 i have been in relationships since i was 13. The longest ive been between a guy was like 4 months. My most recent ex i dated for 4 years! I litterally dont know how to be single. I already want another bf. Well maybe not a bf but i want someone i can hang out with and then have sex with but no strings attached. I feel bad i want to have sex already should i? How would i even find someone?