Am very new here, but seen a few threads about people struggling, even disliking their DSC
My Ex’s OW (should stop calling her that 😹) hates my 10yo, it was a bitter break up, and DC saw Ex and OW kissing whilst we were still together, and she constantly lists my faults to DC, I have never badmouthed OW to DC, but they cannot abide each other, I don’t see it getting better as she hits teenage years!
When I first met DH he is PWC of two little ones and his DS was just awfully behaved in my view, they had no table manners, would use words my DC didn’t (“bum”, “idiot”, “stupid”, “shut up”), he shouted a lot, gets angry, and is quite destructive. I was embarrassed to go to restaurants with them, as they couldn’t just sit and eat nicely etc
However ....
Now, (3 years on) I actually really love him, he has chilled out, but so have I! He is loving and sweet, he still gets angry and shouts, but that’s his way of dealing with emotion and frustration, his manners and temper have got so much better (on another subject I think earlier bedtime and less sugar did that!)
So, basically, now I wouldn’t choose to be without him, I would at the start, am not proud of myself for that, but neither am I ashamed, things sometimes take time, I’d never had a boy before, and I hated how loud and boisterous he seemed against my girls. My DC were perfect in my eyes 
now I realise I was a twat
What I’m trying to say is ... a lot of people on here say you must leave any relationship where you “dislike” the DSC, and I considered it, but sometimes it can work round. DSS and I now have a great relationship, I am the strict one, he knows he can’t get away with being rude or aggressive with me, but also I have learned to bite my tongue and give him a break. I now enjoy his company, and he mine
With my own DD (20) I disliked her for most of her teenage years! 
kids aren’t always likeable 