Honestly I never really did. I asked some kid in 5th grade what Santa got him for Christmas and he scoffed at me for still believing. I went, “uhhhh yes… this is information I definitely already knew. Yesssssss…” and never really brought it up with anyone again. ¯\(ツ)/¯
There’s a third option: Black holes create new universes through some as yet undiscovered process. Then your existence just becomes a statistical eventuality, as do every other life that you could ever live.