Whoever told you that was lying to their advantage. Just because you were created for something, that doesn't mean that you have to continue being that thing. Especially if the ones who made you do the things you were made for are no longer around. Also? If you were just an asset, you couldn't feel things and you are definitely feeling emotions and question things. That's just a part of being self-aware.
I'm not sure. With how advanced the technology is here, it could not take very long at all. I would recommend either going to Doom Hospital or to Shuri in New Wakanda. They would be able to help you better than I can with that stuff.