I'm in a similar position to the OP - though now not thinking of ending the marriage.
Hubster and I are very different personalities. I like to do things, go places and see people, him not so much, if at all.
I've previously experienced some 'internal battles' on what to do about it, and around 4 years ago ended up feeling depressed and was considering ending the marriage.
At the end of the day I realised that I had to take responsibility for myself and make my own life within the marriage, if that makes sense. I go places and see people and he either wants to engage with these activities or he dosent, I don't pressurise him to do so, so he invariably dosent, and that's ok. Its worth adding that he is a lovely kind and affectionate man who I do love and also respect, and he is quite happy for me to go off and do my own thing, whenever I want to, including staying with friends in different parts of the UK and going abroad with friends.
It is normal for the OP to feel as she does, but it does need to careful heart searching thinking about before taking drastic steps, and there has been some really good advice from peeps on this thread - thank you.