I need help.

[simonheros]

I tried indoor soccer for about 5 years when I was younger

Why Indoor?

As I mentioned in the rest of that post, I just can't handle long sprints. Indoor soccer is held on a basketball court. Outdoor soccer is held on a[n American] football field. There's a huge size difference; outdoor soccer is pretty much all sprint.

PFFFT No.
I dunno anything about indoor soccer, but it's not all sprinting.
Sure there are moments where you have to do it, but you always stay in the back if you're on defense. Only attackers sprint as much as you think they do.