Hi Clay!
It's not common for a man as young as you to experience ED, but it does happen. There are a couple articles about ED in young men that you can read to get more information.
Hardvard Health Publications answered the question of a 20 year old man here.
You can read more about ED the causes and risks here.
Dr Harmon answers questions from a young man here that you might be interested in the answers.
I hope this helps. Let us know how you are doing!Vicki M