My first experience

Hey so I have been dating a girl for a few weeks now and I just had sex for my first time. Unfortunately I was pretty nervous and I lost my erection while we were having sex. Now the last few days I’ve been self conscious and I haven’t been able to achieve a full erection since. Does this mean I have ED and never knew it or is this just a mental thing.

It’s likely mental brother. Getting comfortable and relaxed with a trusty partner will help. Keep following the exercises on the app, it’s really helpful.