Does anyone else feel like they've forgotten their whole life?

It's a very weird feeling. I believe the term is disassociating, but somehow it is deeper than that. To me, it's like everything that's happened to me before the moment I'm living in is blurred, like I'm looking through a dirty glass or at something far away. Sometimes, I can barely remember what I've done the previous day, but once I look at photographs or reminisce with somebody, it comes back to me. I wonder if this is normal, or if I have some sort of memory problem, or it's something I'm just stuck to deal with?

What could have caused this? I believe I had a very normal childhood, attentive parents, etc., but there must be some sort of reason. From the people I've talked to, this doesn't seem like a common issue. Does this happen to anyone else?