Is it wrong

I'm a mother of 2 I have a boy who is 2 and a girl who will be 1 next month, lately I've been feeling like I'm really bonding with my daughter and that I always want to be close to her, but when it comes to my son I feel like he's there to just wind me up and have to make me shout at him when he does something, I give my children equal amounts of attention, but I just feel drawn to my daughter more than my boy :( I feel terrible for saying it, when he stays down my in-laws for a night I feel less stressed until the time he arrives home, me and my boy never had a chance to bond when he was born he was always sick and we were both in and out of hospital, sleepless nights turned into many arguments and screams and resulted in me sleeping downstairs with my boy for 3 months straight until he could start sleeping properly on his own, I love my boy and wouldn't change him for the world but I've felt like this for quite a while now and I'm not sure why, my daughter she brings me such joy everytime I look at her I can't help but melt inside. I feel like a terrible mother 😫😔