I felt a lot like that too.
Two of my friends had babies around the same time DS was born, and the difference between them was staggering.
DS was unputdownable. I remember being astounded at my friend gently placing her AWAKE baby into a Moses basket and looking at her as she cooed and drifted off to sleep. Alone. For 1.5 hours.
Meanwhile I was rocking, singing, shushing, patting, dummy-ing and feeding DS to sleep. Often it would take 45 minutes to get him to nap for 30 minutes.
I spent a lot of time clock watching to make sure he didn't get overtired but it made no difference, he fought sleep like a bloody gladiator fighting a lion!
To be perfectly honest, I found the first year very hard with him. We had a rough time from 18-24 months too, he was a very loud, stubborn, tantrumming toddler then (again, while my friends' kids were quietly holding hands with mummy on walks). DS would throw himself on the ground in the middle of the road, refuse to hold my hand, run away, scream blue murder in his buggy or car seat... it was exhausting!
However since he turned 2 he is far more manageable and far more agreeable. He's also really inquisitive, intelligent and funny. Far more so than said friends' kids
.
I do think DS was my "typical" number 2. The good news is that said friends' are actually on number 2 now, which should make for interesting viewing when they hit the awkward stages!