Bleached my hair and it's disintegrating and turning to mush. Cut it off and get hair extensions? Ideas?

Go to a good hair dresser and get them to create a cute, very short hair style for you. A lot of people think they won't look good with short boy-ish hair but as long as you are confident you can work it! After they cut it (don't let them blow dry it, straighten it, or ANYTHING) use a really good deep conditioner. Wait a week and see if your hair has gotten any better (hopefully it will be). If it is, I would just use a dark brown or red for now to cover up the blond mess. In a couple of months when your hair is healthier, you can try going back to blond.