Some people believe some don't. i was skeptical until I went to Germany. When I found out that I was going to Germany to lead seminars, I balked and did not want to go. Refused. But eventually got over it. When I arrived in Munich, although I had never been out of the country before, I knew the city. I just knew where places were, it was familiar, home. Puzzling. Years later, I lived in Frankfurt and had had so many flashbacks I knew that I must have been in Germany during WWII. My x-husband had a reading done and all was confirmed. We were engaged to be married, worked for the French resistance/underground, I was 15 years old, and other details (our names) gave me goose bumps. I died in a concentration camp. Explained a lot to me. In the 1980's, I visited Dachau and wrote a story called Just Someone Who Cares about the visit. Email me if you'd like to read it. You might also want to read From Ashes to Healing and Beyond the Ashes, written by a rabbi, Yonassan Gershom, who tells the stories of real Holocaust survivors, people who died during WWII who came back quickly to live during this time.
Other lifetime am aware of is as a gypsy, also a teenager, a shaman leader, who loved a man/husband who died, and a cat that was stolen from her, betrayed by family and friends, left home and wandered for years in grief.
I usually do not recall past lives even during meditations but these two lives have been confirmed in numerous ways. Needed healing.