Giving up?

So I (21m) have NEVER been in a relationship, I have tried dating apps multiple times and absolutely nothing has worked, ive went out to bars, events, and my hobbies, Still nothing. Even if I do get a chance to have a convo with a girl it'll only last for abt 4 days and I'll never hear from them again. At this point I'm giving up because now I feel so far behind that I don't even know where to start. What do I even do?