Uncomfortable at 23 weeks

Sammi • Married to my bestfriend and pregnant with a baby boy, due Feb. 6th 2016
Is any else already feeling uncomfortable? Sometimes my stomach aches and baby just feels really heavy already in my lower belly. My back aches im exhausted all over again, no energy to do anything and just want to sleep. I can never get comfortable at night either unless im on my back. Is this normal so early? I feel like an old women lol