I feel similar in a lot of respects. I get bored very quickly with things, and there is nothing worse than slipping into a routine. There are two things that have really helped me. Firstly, keep trying new things, constantly. If you enjoy something, keep at it until you get bored, then keep at it for a few weeks/sessions more. If you're still bored, give up on it. But for me, I have found one thing that has held my interest for six months now, which is an achievement for me.
The same applies with relationships. Make an effort to meet as many people as you can and have conversations with them you find interesting (for me a lot of small talk is incredibly bland, obviously you'll have to suffer a little of that, but steering the conversation to something that holds your attention a lot better will keep you entertained and if the person is uncomfortable with it (depending on what you find interesting) then they're probably not the sort of person you want to hang around with anyway. Similarly, with women, if you're unhappy with the current setup how about trying to get to know them before entering into a relationship, seeing if at least they can entertain you for a while before it becomes anything more.
That's the fun side. But unfortunately you will have to do repetitive things in order to live. Here, plan out a few life goals, whatever you want really. Most important for me was picking a career that had the variety for me to actually enjoy it that also paid reasonably well (not exactly easy, especially as the general public frustrate me XD). For me it was teaching (which pays well in London) so I'm currently working towards that. Plan out any steps you need to take to get to that career and enact them. Then when you feel yourself slipping into a routine, you can at least look forwards to see where it's leading. Of course still try to break it up with as many activities/people as possible.
I also know someone else that feels the same way about nearly everything, so believe me you are not alone. Quote me if you have any questions, and remember: variety is the spice of life.