Failures in bed at 22: do I have erectile dysfunction?

Hello, I will try to be brief. I am 22 years old and for almost a month, I have been suffering from what I believe is erectile dysfunction. The symptoms are the inability to maintain the necessary rigidity for a full-on sexual act, or sometimes, but more rarely, erection subsides after a few minutes from the introduction of the penis in the vagina of my partner. I practice sport and I take creatine, arginine, proteins and the like, but for 3 months this summer I had a break from the workouts, and I don’t take anything anymore. I have sex about 2 times a day, but not every day. I use a condom, thin type. I hope I have provided all the necessary information, and if you need anything else, I am ready to write what could be missing. I would like to find the solution. Thank you.