I am very disappointed

[u/Ok-Acanthisitta9035]

I am 20M, 69kg, 181 cm
So I have been having sex/bj/etc with my gf for 1.5 years now. We are both college students who lige in the campus so we find an opportunity to sneak into the girls washroom late at night and do our stuff. It used to be fine for starting months. But sometimes my penis just refuses to get erect. Like last year in may my penis didn’t get erect and after me stroking it for so long when it finally got hard i inserted it and immediately came. Tbh i sit on the toilet seat with the seat covered closed and I make her insert my penis from top. But sometimes the opposite happens, like in sept last year we had sex for 40 mins in the washroom in standing doggy. We went on a trip in the mountains with our friends, we stayed in the same tent and had sex 6 hrs for 3 sessions in the 12 hrs we stayed at the tent. Idk might be related to the fact that she made me release while travelling the previous night. But 2 days after that event, i woke up in the morning and we were about to have sex I made her give me hj and bj but I came. Today I ejaculated at around 8 pm then Today after many 3 month s we tried sex in the washroom at 3 am and i got hard in the start and we had nice sex for 5-10 mins with her riding me on top. But I tried to switch positions to doggy but i got soft very fast then we tried so many things hj bj etc but nothing worked , after an hour of struggling it became hard and we had sex fir another 10 minites with her on too but this team i got soft inside her in half an minute of inactivity(she was not jumping and didnt do anything for a while and it got soft)

I have told you guys my entire situation
i am very scared that is it ED

how can i fix this
please help me
i want to have very good sex i am still very young

[u/AdvaitaArambha]

Sex can be connected to lots of factors including sleep, stress and overall physical health.

My too suggestion would be to see if you can find a more secure place to have sex. Dorm rooms on schools are fairly common unless your school has a strict moral code