Welcome to the Erectile Dysfunction community. Topics covered include drugs that cause ED, heart-related ED, kidney-related ED, impotence,
multiple sclerosis, nerve damage, penile pumps,
Peyronie’s Disease, questions to ask your doctor about ED, social issues regarding ED, stress,
spinal cord injury, and surgery.
I'm not a doctor but you are young and healthy so this is probably just a case of sexual performance anxiety. Don't worry! Just relax and things will improve with time. If the situation persists, however, go see a doctor. It's no shame to seek professional help and today ED is easily treatable.