can't get baby to sleep on his own

Ally
My little guy is two weeks old and I have not been able to successfully get him to sleep in his bassinet. Sometimes he will start out in it and then after the first feeding he won't go back in, but most nights it's like the second I put him down he's screaming bloody murder until I pick him back up. In order to maintain some sort of sanity and get any amount of sleep at all I've been sleeping with him on my chest. I know cosleeping is super super frowned upon and I really want him to sleep on his own but I can't figure out how to get him to do it. PLEASE HELP 😩