7 month old sleep/routine tips?

I can't get my baby to nap or sleep without a bottle. We've been cosleeping for a month and I'm trying to get him back in the crib.

If I put him down in his crib, he wakes up instantly and screams. A very high pitched scream that only gets worse. If he's tired but awake, same thing. And then he wants to stay awake for another 2.5-3 hr wake window. I try to read all I can and people make it sound so easy. Just have a routine and place him down when he's tired.

When he does stay asleep, he wakes up after 20 minutes and is ready to stay up, can't be rocked back to sleep or anything. So the only way for us both to get sleep is to cosleep (it's just me and baby at night and in the morning/afternoon).

Am I the only one ? I feel like when people try cry it out, there's no way their baby cries sound like this. It's so intense and piercing. Any tips and routines would be so helpful 😢