Should we tell the person we are going to marry about the sins we have committed?
When I was about 11 years old, I had a situation with a fellow male that consisted of flirting. Many years have passed since then, every time I think of it, I hate myself, I don't find myself worthy of living, I don't find myself worthy of being a Muslim. After this incident, I have never attempted such a thing. I suffer from remorse, I can't breathe, but I cry and repent in the presence of Allah. Also, no one knows about this sin, I didn't tell anyone. Now, if I intend to get married, should I tell the person I will marry?
If you have repented, which you say you are:
Erase this event from your memory.
Never, ever tell anyone. Don't even remember.
Neither your marriage nor your religion is affected by it. You have to accept yourself as if you've never been involved in anything like this. The devil wants to distract you and exploit you for a sin that Allah forgives. Don't be an instrument of the devil. Live your life. Hold on to your religion.