If I die before I can confess my sins, can I just confess them to God in Heaven?

When packing for a trip, sometimes we forget something small: a toothbrush, shaving cream, or socks. In order to compensate, we simply make a quick pit stop at a nearby convenience or department store to buy a replacement for the missing item. Can confession work similarly? My Question: - According to Catholic teaching, if I die before I can confess my sins, can I just confess them to God in Heaven? If you think about it, it would probably be much better to confess your sins to God than any human on planet Earth.