I'll never be good enough for anybody. Nobody has ever shown interest in me or asked me out for something as simple as coffee.

Hey I have low self esteem also but I bet you there have been men who were interested but they were thinking just like you or didn’t have the balls to ask you out. Women often think they are being obvious that they are interested in a guy and that guy has no clue. Especially now how some women will say a guy is being a creep but they’re just acting friendly.
Talk to someone you’re interested in and keep talking, compliment them, or just ask them out.
Give it a shot…then don’t give up until you find someone!