I also have mild OCD, where I become a little anxious and frustrated if I don't do things in a set pattern, or that items, ie tins in the cupboard are not displayed 'brick wall' and all labels facing.
Although I deal with people aptly at work, I used to hate social occasions. I felt awkward and out of place. I learnt to smile at people and say hello, and found that conversations soon started flowing naturally.
Is your lack of motivation down to doing routine, repetitive work? Most people would become bored with a job that is too easy. It's like having to learning the alphabet day in day out when you already know it. It sounds as if you feel you have let yourself down by not having a career, something to focus on. But you are only 44. Spend a little time (after work) looking for something that will challenge you, whether another job or a hobby.
Also, take the advice of others and pop into your GP who will be more than understanding, with plenty of resources at hand. Perhaps sort through your present difficulties and then get out and find yourself the perfect partner. That way you will have something/someone to work towards.