Does getting a lotta memory flashbacks, mean I am depressed?

No. You did not specify bad or good memories, , i will assume bad. Lots suggests it is getting in the way of your functioning suggests an anxiety disorder that could likely benefit from treatment, counseling and possibly medication.
No, but not good! Please get an excellent psychiatric evaluation; this is a red flag. Not to panic;however, more than likely this is from indiscreet, overzealous use of ''god'' drugs such as lsd, mushroom, green magic. Also ptsd must be considered as well as the much rarer first sign of brain disease (tumor, malformed veins in the brain). Of great concern is serious psych. Diff .Of cognition-schiz.;infection is last.