NC for this, long time poster.
I know this topic has been done to death on here, I participated in the 'too good to leave, too bad to stay' and similar threads but wanted to start my own as I feel in turmoil at the moment (and have for some time). MN has been an absolute lifeline for me in the past and any advice on my situation will be so appreciated.
My husband and I have been together for 9 years, married for 1, 1dc primary age. It hasn't been smooth sailing, with ups and downs like any couple but gradually year on year the 'down' times have outweighed the ups and the balance has tipped.
Before we married I had real doubts, which I realise I pushed aside as I just didn't feel ready to break up our family and felt so guilty at the thought of the impact on our DC who was looking forward to the wedding, loves dad, is happy and settled. I guess I almost thought, well I've come this far, our lives are intertwined, mortgage, child etc and I'm not willing/don't feel able to split at this time so "might as well go ahead".
I now see how wrong this was, as when I think of being together the next 30+ years it makes me die inside.
We had our DC pretty soon after meeting, DC has additional needs and I think as this consumed our attention so completely, this was our main focus and we didn't consider enough, how incompatible we really are. When I look back over these last years I feel I've almost sleepwalked through it.
H, while he has many good qualities, has quite a difficult personality, quite addictive (excess alcohol which has been a real issue), he is also moody, quite distant emotionally, which in time has caused me too to become emotionally cut off from him to the point I find him incredibly irritating and nauseating (for example his personal habits which are pretty gross). I don't show this but feel it daily and I'm glad when he's not home 
Writing this down makes me realise how bleak this is. I just feel such a fool to suggest a split so soon after marrying him, in hindsight I am only with him for DC and should have separated years ago.
I don't know what I'm asking really but thanks if you got through that ramble.