I agree, you sound like a very dedicated mum! I'm also a mum and I also feel the need to have something seperate from being a mum.. for me it's designing and making accessories and bags and cushions and trying to turn it into a small business.
I know you said you feel like your life has been wasted up until now but do you remember anything that you really enjoyed or felt passionate about that you could bring into your life now? Whether it's writing, dancing, running or something else..?
Daycare is brilliant for children, my son went for a little while and advanced so much with his speech and social skills and loved playing with all his new friends! Even if your son went for one afternoon a week, you could maybe do a class or go to the library or be at home doing something you love. It will make you feel more YOU again, give you something to look forward to and you could get some social interaction out of it.
Same goes for getting a small part time job - a few hours a week or an evening or two with your parents home for your son perhaps?