Hi op i've got 3 kids.
I was like this with my first spent hours getting her down resented her loads, DD2 was & still goes to sleep easily but DS was the same as his big sister he never wanted to be put down, we tried to get him into a routine at about the same age but he just kept waking up so we just stopped and decided to go with him rather than stress ourselves out.
He came downstairs with us while we watched TV he'd usually have a crawl about or sit on our laps.
It was a really great decision cause it stopped us resenting him as soon as he started having longer sleeps and could be put down more (about 9/10 months) we re-started a dinner, bath, bed routine.
I know lots of people worry about getting them into a good routine early but 6 months is still very young and it's not working for you so make a decision to enjoy your baby honestly give it a few months and it will get better.
He's just turned 1 & is getting easier to settle off to sleep (tonight it took me 5-10 of breastfeeding & he was gone).
Another thing I've learnt is start settling them before you think they are tired so they don't get over tired and have a meltdown this applies to my 8 & 10 year old as well as the 1 year old.
It's rubbish but you are doing great 
