Greetings, I've been experiencing problems with having a full erection during intercourse. I'm a 24-year-old male and I've been experiencing this issue for 2-3 years. I've done light research on ED. I know that causes might be physical or psychological, or perhaps a combination of both. I do light exercise (BMI=23.9) and I'm not a smoker or a drinker. I drink or smoke once in a while. What can be the issue at this early age? How do I figure out the causes and treat them?