The problem you have (and many before you, icludng myself) is that you've been hurt severely very early on. Because of this you find it hard t become close because youre afraid you wll get hurt again. The thing is, just because someone hurt you once it doesnt necceserally mena it's going to happen again. Maybe you can explain your past to this woman.
it's possible that you MAY get hurt agan, but at the end of the day, if you dont open your heart up and make it vulnrable then you may never find happness with another person and you can't live forever just screwing around - well, you could, but i doubt it would make you happy.
good luck.
~There is nothing wrong with going to bed with someone of your own sex. People should be very free with sex, they should draw the line at goats.~ Elton John.