How much should your partner know about your past sinful life?

[u/Aware-Conflict-4560]

I feel as if full transparency should be had with your partner always and with everything. I think your other half should literally be your other half, which is kind of a double edged sword if you're not comfortable bringing that past up. It makes me second guess whether I would ever pursue marriage, because if I don't tell my partner everything, then it'd be like they've fallen in love with the picture of myself that I painted where I left parts out. And if I am open to everything they may feel inclined not to pursue a life with me which is understandable, I think we are still allowed preferences in the partner we choose to spend our lives with. To clarify, all of this would be in the dating/premarital stage of a relationship, not like I've said my vows then I tell them everything.

How much of your past do your partners know? Do or did they look at you differently because of it? I guess to look at one differently because of their sins would be a sin in itself but we're not perfect. I'm young(21) but this thought process makes me want to make peace with being alone even though I don't actually want that