HELP!! Feel alone and trapped in my marriage

I feel alone a lot in my marriage (17 years). My SO doesn't want to do the things I want to do. The things she wants to do I find boring. I don't want to have to do the things I want to by myself, why bother being married if that's the case? IF we do something I want to do it always has to be watered down so much to be acceptable to her that I really don't care that much about doing it anymore. I feel like I'm supposed to go to work, come home, do nothing (a.k.a. watch TV) and do it over again, to me there is no point in living like that, I feel like I'm just waiting to die. Then I have to listen to being told that something is wrong with me because I don't want to do the same thing all the time and if I'm not happy it's my problem. Our sex life is so-so. Frequency isn't a problem but it's just boring for the same reasons. I was thinking last night when she initiated and was on top that I could have just gone to sleep instead as its just going to be the same thing as last time, been there, done that. I didn't have the heart to say anything about it, it would just make things worse for me anyway. I want some creativity or foreplay out of her. I'm at the point where I'm completely broken down and don't even bother to suggest things I want to do anymore. What's the point, I'm either going to be told no or have whatever it is so tamed down that I couldn't care less about doing it. What do I do? I'm miserable and I'm tired of being told there is something wrong with me because I need to do new things and be adventurous to be happy. I've thought about leaving but that means a major financial loss for me and their are kids involved as well so I feel trapped. Lots of days I want to leave work and just stay at a hotel instead of going home, unfortunately I'm to responsible to waste money on something like that. There is no one else involved, I'm not having an affair and there isn't anyone I'm interested in.

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