Should I play football next year? (High school)?

I played football last year, as a Freshman. It was my first year, and I was a WR and played on Kickoff. I really didn't play much because there were 15+ WRs and no cuts. Next year I wan't to play a different position, maybe a running back or outside linebacker. Im about 5'10''- 5'11'' and 140-145. I am going to go to a off season conditioning and probably get bigger then. Any ideas?