I need help deciding what football position to play...?

i am 5' 4" 135 lbs. and im pretty built.. im expecting a growthspurt soon and i will be a sophmore in highschool next year. I have always played fullback and have been good, but there is someone on the team who is bigger and better who plays FB. So my frshman year i was backup linebacker... It was weird and i didnt feel as comfotbale till the end of the season.. should i learn linebacker and possibly start or be a backup fullback.. i like FB cause i can just hit people but hittin people as a linebacker feels different because i have people blocking me when i have to be somewhere.