Memphos finest,
You sound so much like me, it's scary I have the same issues. You really aren't alone in this.

I would love to be able to tell you the magic trick to feeling better, but I don't know it! What I would say is to try to think of the positives.

I don't know you, so all I have to go on is your post, but a couple of positives that jump out are:

1. Your body probably isn't as unappealing as you think. You play sport and lift weights, although I appreciate your back is stopping that at the moment.
2. You have a good heart. I know there's nothing in your post about this, but when you do find yourself a lady, you're not going to mistreat her because you've had to wait and will appreciate her.

As Mudcrab said, you are being hard on yourself. Possibly because you don't have your normal sporty outlet so everything is getting on top of you. Do you work? Are there any social outlets via work or maybe your mates you can try to use to ease the social anxiety? You may not meet anyone directly at first, but small steps like that may help.

Also don't discount a therapist. I've never been to one myself, but a friend has for a different reason and has said they befitted greatly. I'm close to that step myself now, but lack the funds at the present time.

Good luck. I hope that helps a little.