I've read too many Reddit stories where someone is taken down by the psychic pain of learning a 10+ year old secret their spouse kept from before they married. Let me blather into the void for a minute.
No, it's NOT ancient history for the person just learning today; it's fresh & raw. And your 10+ years of lying continued right up until your spouse found out. The secret was compounded many times by the betrayal of trust.
Come clean BEFORE marriage.