Okay so, I used to have no problems getting an erection being younger. That all changed last May when I started working at McDonalds. There was a girl I liked there a lot. And I could achieve erections no problem. I was 16 at that point, and am now 18.

After talking to this girl for a while, and working at McDonalds, I noticed that it was starting to become harder and harder to achieve an erection. Looking back on it, I shouldn't have even tried talking to this girl cause she caused me a lot of problems and stress. And then the stress from working at McDonalds as the managers there were very bad. I am a bit overweight, but that never stopped my erections before. I had also started eating more McDonald's at that point and gained quite a bit more weight

Now, I quit McDonalds this May, and I started to notice that after a little while, my erections were coming back, but still, they weren't as hard as they used to be. And they still aren't.

So, now to the main point after a little of the backstory. I am still a virgin, and I was engaging in sexual activity with my current girlfriend. Where, at the beginning I had achieved a decent erection which lasted halfway through, then started to get limp, and I tried extremely hard to keep it erect. When I had finished pleasing her, we decided to have actual sex. I noticed that my penis wasn't staying erect anymore, and I lost whatever erection I had left after putting on the condom. Is this psychological? Or is this a physical problem? I love my girlfriend a lot, and I don't want this to get in the way.