If you were my patient, I would stop your birth control, repeat your pap, and test for STDs. I also always do a pregnancy test. This is the treatment that I would standardly do for any 19 year old.
IF you need contraception, I would consider starting you on something with a little more estrogen in it--or waiting until your normal cycles had thickened your uterine lining back to its normal size before re-starting your pills. Depo provera almost ALWAYS causes abnormal bleeding, so it is no surprise that you had it too.
I would then proceed based on the findings of the pap. If it was normal--I'd repeat in one year. If abnormal-I'd do what was necessary at that point.
I hope this helps!
what birth controls are higher on estrogen?