Does breastfeeding mean no routine??(sorry long)

[NewMamaMia]

I am bf exc ds15 weeks(he is my 1st so please bear with me) and he has always been a bit of a nightmare when it comes to sleeping,eating etc.
Everything is still so random with him,and im lucky if he goes 3hours without a feed(night and day).
He will not go sleep unless i am near him,and when put down he immediately is aware and cries until is picked up.Every night and day i do try his cot,sometimes it works,sometimes(more often than not)it doesnt.Against my wishes he is now co-sleeping at night.
I have tried making a bedtime routine hoping that this will help him go longer at nighttime but as his feeds and sleeping etc are all over the place,some nights he misses his bath and bedtime is late late and not 7.
Is bf why there is no routine?Can i slowly get one while still demand feeding?Do u all think if he did have routine he night settle more?
I just dont know what to do and whats for the best.
Thanks to all who reply.

You say eh won't sleep without you, is it his startle reflex?
Have you tried swaddling?
I'm not sure what age the reflex goes or swaddlign stops helping but DS2 is 3weeks old, he will sleep on me for ages, but not in his cot, I started swaddling as I noticed he had a strong startle reflex and now he's much much better at sleeping in his cot already.

yeah i tried swaddling but he hates not being able to moveand screams blue murder, so i put him in his own sleeping bag and that seems to be abit better.
At times i do gently hold his hands together until he is in a deeper stage of sleep,but thats only sometimes when he will let me!!!

and aaaaaw!!!3 weeks!!that seems like not long ago