For years I engaged in premarital intercourse, with multiple partners, I am now married and my wife does not know anything of this past.
I feel as though my Christianity is being tested, please help me.

you must tell her before the devil gets a hold of you

Go confess, I hear that works.

I don't know about this devil business, seems somewhat far fetched. Confession, well I haven't done that in a long long time.

id tell her, the rapture was supposed to be last week so you might not have much time left.

he has to confess to the lord first hes walking in the way of devil

Also, how does that change things for my wife and myself?

does she think you were her first time?

It doesn't, just poking at it.
The only thing you can do is tell her, keeping it away from her will destroy whatever "afterlife" you might have.
As far as I know.

Yes, I feel so bad