<human>: Im not the most aggressive guy and I have trouble in the bedroom area and my GF complains that I am not initiating enough. We never really had that good of a sex life to begin with. It would take me a long time to build up an erection let alone maintain one in bed (I don't have a physical ED) so I've kinda been hesitant because it is incredibly humiliating to try and fail. We've been apart quite a bit so it wasn't as prevalent, but now I came to visit her for the past 5 days and I wasn't able to rise to the occasion at all and today she made an insulting comment about it which she immediately felt bad and regretted it and kept apologizing. The thing is she doesn't completely get it. She thinks that I have no interest in sex and that I am out of shape (which I kind of am).

But now, there is that anxiety and failure in the air and I just feel so awful about myself. She thinks that I am angry which is the facade that Im putting up right now with silent treatment, but in reality I feel like a piece of shit but I can't portray that to her. She expects me to be this manly man and Im just not. What do I even do? How do I communicate with my GF?

Can you summarize the given text in a few sentences?
<bot>: Can't perform in bed, GF thinks im not interested in sex at all, but I feel ashamed to admit that I just can't