Fantastic first post, GayleMarie. Don't worry about whether people are looking at your body at the pool or not. Chances are they're too busy swimming, or too busy feeling insecure about their own bodies, to give two hoots about what you look like!
I have a sore back and sore feet as well, so I can sympathise with that being a reason to want to lose weight. I was diagnosed with plantar fasciitis about three years ago. I was told by my GP that losing weight would help fix the problem, but there was the catch-22 that you need exercise to lose weight, and the PF meant it was very difficult to exercise! Good luck with your weight loss and I hope that it helps fix your feet and back. The good news is that my feet are almost better now, so weight loss certainly helps!
Butterfly Dawn is right that motivation varies constantly. You can't expect yourself to be 100% gung ho every minute of the rest of your life! When I started on my weight loss journey my motivation was to no longer look like the bloody photos that were taken at my sister's wedding. I cried because I hadn't realised how big I'd gotten until then. As I started to lose weight my success helped fuel my determination - if I'd lost three kilos so far it was proof that I could lose another three kilos. Motivation also came from the fact that I'd started to enjoy eating healthy food, preferring salads over fatty foods, and that I was enjoying the exercise I could do. As I've been getting closer to goal my body feels better than it has in years. I'm noticing how much better I look and feel for every kilo that comes off. The idea of abusing my body by gaining weight again horrifies me. Being at my goal weight is becoming more of a reality and I can feel what it will be like to get there!
When my mojo buggers off I have to use other methods to motivate myself. The most successful one I've found is to fake it 'til you make it. If I don't feel like going out for a walk I force myself to do it in small increments. Just get your exercise gear on. Just step out the door. Just walk to the corner... pretty soon I'm happy to start running. And I use constant positive reinforcement to tell my subconscious how much I am loving exercise. I talk to myself in my head about how FANTASTIC exercise is, and how much I love it! And if all else fails I ask myself 'If I were to magically become a size 10 if I run another hundred metres/don't eat that biscuit/avoid that alcohol could I do it?'. The answer is always HELL YEAH! So I tell myself that if I do that good thing I WILL magically lose the rest of my excess weight all at once. Not once have I looked back afterwards and thought, "You know what. Since I didn't shrink to a size 10 immediately I think that was a waste of time".
Good luck! I look forward to reading about your weight loss journey, GayleMarie.