I would just like to add something you said about you not being mature enough to handle a child.. well if you are not mature enough to wear a condom than you are not mature enough to be having sex. Also, if you are not mature enough to handle the possible ramifications of having sex, than again you should not be having sex.
With all the diseases out there today, its immature NOT to wear a condom even if the girl is on birth control. And asking her if she's on birth control AFTER you cum inside her is just stupid.
Keep this up, and you will be a daddy... or end up with an STD.