One problem that many men have is they think they have to be flirty or witty or funny all the time when they talk to women. They try too hard, get nervous and end up coming across as needy. Let's understand that women are human beings just like us. No sane woman would expect you to talk in an alpha manner all the time. If you are not used to flirting or bantering with women, then first, talk to them normally like you would with your male friends. Only after you get a hang of this will you feel comfortable talking to women and being fun around them like you are with your friends.

"Be yourself" is a lot easier said than done. I myself have this issue sometimes. Working on it.