I know this feeling all to well, its almost constant, and I have been trying hard to lie to myself and try and convince myself that I am worth the effort to save, that I can and should be happy, that I can be the woman I see myself as, it works, sometimes. Trying to get more meditation time in as well.
But the best advice I can give, is to find people who you trust who you feel comfortable talking with, and when you hurt, vent a bit. For many years I had exactly one outlet a single wonderful person, who when things where at there worst was there for me, but it was so very hard on both of us and I will love them forever for standing by me, even if I didn't meet her for 16 years. After coming out I have expanded that circle, now there are a half dozen or so people I confide in, and it has brought me closer to those friends than I ever imagined I could be with them.
even if its just here and now, talk it wont actually fix anything, but it makes things easier to handle knowing that someone else is listening.
Serena