I can't get my girlfriend to cum + premature ejaculation

Recently I tried going for the strategy of getting my girlfriend to cum first by trying to eat her out and fingering (sometimes a combo of both), but I ended up doing that for more than an hour with her. She would moan and feel pleasure but I didn’t want to go down on her until she came, as the title card says she still wasn’t able to, but even when I eventually went down on her I came within the first 2 minutes. The only things I can think of is working on my techniques (I did curl my fingers to try to hit her gspot) or getting a toy. Luckily she’s okay with how it is somehow but I still want her to climax too. Any tips? Personally I don’t mind ejaculated too early but I want her to cum too is the main part, although I will probably continue mojo and maybe see a doctor.

Side note:
Sometimes when I put the condom on it just kills my erections. Why??

What is your approach to clitoral stimulation?

i will just say every girl is different and like different thing, my wife canot finish without penetration, but if she is on top she can finish fast (if in mood). If not in mood then need to get her in mood if possible