Stuck

Sheldon: I feel somewhat like an inverse tangent function that’s approaching an asymptote.
Kripke: Are you saying you’re stuck?

The above quote from The Big Bang Theory was in my mind as I was thinking about this post. At the moment I feel kinda stuck.
I'm not particularly happy with some areas of life and while I'm not powerless to change some things it seems I am lacking in the willpower, or 'get up and go' required.
The first is some frustration in having actually gained weight since I started going to the gym late last year. I had hoped to lose 3-4kg instead I've put that on and a little bit more. Some of it admittedly can be contributed to increase is muscle tone (not that you can tell for the most part).
Part of the trouble is that I seem to keep injuring myself in the gym - straining my back is pretty common - and what I think needs to be done is to have a proper program organised so that I'm not overdoing it rather than doing things on an ad hoc basis.
General exercise is something I also must commit a bit more to. I used to love taking a walk on most days now I don't do it nearly as often. I'd also like to get to the pool a bit more.
The second thing involves my attitude to money.
I'm fortunate to have a good job and one that I enjoy but I haven't been as vigilant as I should be, especially given the way things have been going not only in the media but economically in general, with saving. I definitely have saved a bit this year but events in the past couple of months have seen me undo some of that good work.
I've set myself a little goal to save a certain amount before I head off on my next holiday in a few weeks time so hopefully I can stick with it. I don't like the way it makes me feel when I realise I've blown money I could have been using for something better - even for paying bills.
Then there's the fact that I am 37 and no closer to not being single than I was at 27. Don't get me wrong I'm enjoying the freedom that it allows and having some fun along the way but, ultimately, I wonder whether 'settling down' is for me. Are children for me?
There are a couple of other issues that remain in limbo, only solidifying the feeling of being stuck. One in particular would be so easy to shove along but I'm not sure if it is actually a good idea given one of my above points.
So I'm stuck not knowing which direction is forward, what decisions are the right ones to move forward and to shake the occasional feeling of discontent.