I can't explain myself properly, maybe because of the translation?
I say I already do these things. I do sports, I get fit, I met a girl, and that wasn't enough, I convinced her to have sex. But last time I had trouble with erection, I asked what I could do. You're telling me to start doing things.
The question is not I'm going to masturbate but I can't get an erection, I'm going to have sex with a girl but I can't get an erection.
That's a good start, now you need to start dropping pounds.
Instead of worrying about your lack of performance, start thinking of how you are going to manhandle this woman in the bedroom and how she is going to have to tap out from you fvcking her so hard. That's what you should be thinking about.
In fact, I don't know how to abuse a woman when I can't even penetrate her.
You worry too much, erection problems in most cases arise from worries, performance anxiety.
As mentioned in the other thread, avoid masturbating.
Too much pornography leads to a distortion of reality.
Start to get it into your head that the more you worry about a bad sexual performance, the more likely it is that it will end like this.
Do you even like this girl? It's important that you like it, I also have difficulty having sex with girls I don't like. It's normal.
Only her body is beautiful. Thats it. Also I have a little question from last time. My penis is not thick, not long but the condom was too tight. Why could this be? I couldn't put it on comfortably. Instead I opened its mouth and put it in at once. This time it was too tight. Then I tried again, same thing. It was too tight in short. That's why my erection ended. It was already very little because of masturbation, it ended completely.