Depo-Provera and bone mass

I am 24 and was on "the shot" for 2 1/2 years, I always had problems with spotting and felt really depressed (would cry easily, very sensitive). I was pretty much bleeding daily but didn't do anything about it. I was really out of touch with reality - it was really alarming when my doctor said casually that I should do a bone density test because taking it for more than 2 years could decrease your bone mass. What caused my to get off of the shot was that my provider quit carrying it in their office and not realizing it when I set up an appt. I was to late to get it...etc. I felt especially depressed after that. Finally after a several months of not being on it, I started to feel back to normal. This was just my personal experience and I would not recommend using depo.