Your lack of confidence is keeping you from telling these girls what you really want and deserve and you are letting them walk all over you. All you have to do is write down how you really feel and FAKE the confidence. You can even do it over the phone if you want to. The second they get that rejection from you, they will instantly be turned on by you more than they ever thought they could.
The first time this works for you it will build your confidence right back up man. You will realize that over all those years there was nothing wrong with you, you just never learned how to have game!