Have you considered spin classes at the gym
I know all the reasons not to go- gyms are boring, painful, full of wankers - whatever
Fact is that you can smash yourself for 45 minutes and doesn't matter if it's dark, cold and raining outside - so 1 hour + travel time and you're done
If you are in the city you will have lots of nice girls to look at, and someone up front geeing you up to push yourself harder than you ever would on your own
2 of these a week (and some other exercise as well), and it will make your life more enjoyable as you will get fitter
I'm 50 and it's only exercise and work that stop me indulging in all the bad things I love so much (had plenty of counseling, so I've faced my demons :spy
I don't often look forward to the gym and sometimes don't feel like a ride - quite often I'd prefer to stay home and get out of it to be honest
But I exercise because I never get home and think 'oh, I'm sorry I did that'
But when I give in to my desires and stay at home and get out of it I think 'well that was pretty fucking pointless'
I try and remember this when I really don't feel like it (note that this is different to your body saying it's time to rest)
It's all in your head - as Cypher says, if you need help to shift the headspace there is nothing to lose except the jaded outlook
You seem like a nice sort of guy JD, and you're not alone in your struggles for sure - it's the smart ones who get help if they need it (well, I'm not that smart, just had good advice)
You just need to make a start - whether it be counseling, spin sessions or riding to work
And keep your eye on the prize - health and longevity (not weight loss - that is a by product)