OP, it seems that you've given up, which is the saddest thing about this thread.
I'm sorry but I couldn't be attracted to someone with your attitude (the way you refer to yourself and your life must be apparent to people you spend time with, even if you don't intend it) so I can understand why it is difficult to date.
And yes, living with your parents at 37 is strange and also off-putting to potential partners. You are not a 'fully functioning adult' in the way our culture would expect you to be at your age.
There's another thread about people living on benefits. If they can live on benefits, you can afford to live on your salary, perhaps not in as large or comfortable a house that your parents provide for you but a reasonable lifestyle nonetheless.
Why not take steps to improve your earning potential? It doesn't happen overnight but taking steps towards improving a part of your life can be very motivating.
Do things in baby steps. Set realistic goals and aspire to leave home by 40 (or whatever suits you).
As a Mum, I'd feel I'd failed as a parent if any of my children still lived with me at your age. I feel that your parents certainly love you and selfishly love having you at home but they have done you a disservice by not encouraging you to leave and create your own life.