I had erection problems with my girlfriend the first two or three times we were in the bedroom, but now i seem to be doing better. I say better and not great. I can now get an errection but, I'm still hesitant to go on with sex from the foreplay. First off, all the work for getting hard seems to be on me as she doesnt use her hands to help out and oral sex doesn't seem like an option for her. Secondly, I'm afraid the time it takes me to put on the condom and get into her I'll lose the erection. Like i said it's going better but i still wonder about these things.
As long as it keeps getting better, don't worry too much.
I presume you are young, so it may take some time for her to get comfortable with using her hands or even her mouth. You can practice putting on a condom - it shouldn't take more than 10 seconds. Open the package and have it ready to go when you first start foreplay. Play with yourself to keep hard, get between her legs, put it on, and dive in. Shouldn't take even 5 seconds!