19 weeks and still feel aweful

Nausea has somewhat subsided, but am i alone in feeling pain from the pressure of a growing belly? I'm on the smaller side in general always had a good core and the feeling of no muscles in my stomach and the weight of my belly and baby in there hurts so bad. At times I feel like I'm gonna explode from the inside! Is it normal to feel growing like pains and pain from weight of baby and belly? None of my friends or family have had this... So I feel so alone and like something is wrong.