Be careful. Don't go thinking how unfair life is or other such thoughts. Life is unfair and you need to play the game of life with what you were and are randomly allocated.

Constantly improving yourself as other said is important. If somebody tells you that you are fine as you are, tell him/her "thanks" and then tell to yourself "but I will get even better".

And about the girls, don't waste too much money on them. You can talk to them and go out with them, but don't let them use you. This doesn't guarantee success, but it will help you greatly cut your losses in this hostile environment.

How old is your sister? When girls first discover the power they have they are very tempted to abuse it. I think this subsides with time.