Back is KILLING me

I'm 15 weeks and I come home from work extremely sore and achy to the point I want to curl up in a ball and not move. I'm overly tired taking naps during the day going to bed extremely early for the night and feeling like I'm never going to enjoy this pregnancy. Anyone else? Everyone on here seems so happy and I'm happy to be expecting but I'm miserable every single day. I dont feel like myself