[musampa]

I would not start by direct approaching in clubs, first I would start by small talks here and here to get used to talking with girls.

if you have been diagnosed with anxiety and social phobia maybe you should try to integrate into a social group and get comfortable there first before a night game. If you are super sensitive and have some ego issues night game may hurt you more.

I won't repeat what others wrote above: gym, nutrition, dress, style etc.

Good luck!