how to stop being so desperate to have a bf

literally what the title said. ive only dated a guy when i was 17, but it didnt turn out well as he treated me really badly. thing is ever since then, or actually even before my ex i have always wanted to have a bf. literally every bday wish id be wishing i had a bf and the only one i got was an egoistic narcissist, and none after him. granted im still rather young at 20, but idk i feel so impatient?? like im in my “prime” years yet literally no one seems to like me. i get so upset with myself that i dont have a bf when im out in public seeing all those happy couples (not that im not happy for them; i am!). its just so difficult idk what to do