Spoiled little baby lol

Amandarae
So i had my baby 1month ago an when i brought my son home he slept in his bassinet just fine well that only lasted a week my son sleeps with us well on my bfs chest my bf has got him so use to sleeping with us that when i put my son in his crib now he wakes right up an cries ive notice that if me or my bf pick him up when he cries from being in the crib that when we lay him in the middle between us or on my bf chest he goes right back to sleep i love it when my son sleeps with us i feel comfortable that way but people tell me not to do that cause he'll be hard to train to sleep in his own bed when he older has anyone had the problem training there child to sleep in his or hers own room