Nothing works!!?

Hi, I’m Elliot, 18m about 19 … it’s humiliating for me to come and ask for help on here, but … I can’t get a girlfriend:( It doesn’t make sense-I think I understand girls and am comfortable flirting and even approaching female strangers,, Ive even had experience at college where I went around and joined random girls at their table to talk and get their number just to challenge myself, plus Ive watched any and all YouTube videos on this subject and I have tried so many different strategies!!! … So anyway, I’m not asking for some basic advice like “give her some space “or …“avoid desperate behavior “ I need some help and preferably a little from the female side, maybe you girls can help me understand 😂