I delete pictures liberally...and still have more pictures than I want. If you keep everything, the truly special pictures get lost in a sea of mediocre pictures that weren't quite bad enough to get rid of. In my opinion, if a picture doesn't elicit some sort of emotion from me, it's just as bad as a shot that's completely blurred or out of focus. To often we delete the latter when I think we should just get rid of both. If you have ten shots of your dog in ten slightly different poses, pick the best one and delete the rest.
So I'd say go through your pictures and pick out all the really good stuff (and of course the crummy but entirely necessary shot of your kid's/grandkid's/dog's first birthday), and get rid of all the rest, or at least store it in a separate location. You'll feel so much better.
