If I get the Fallout 3 Game of the Year Edition....will it delete my game?

So I just bought Fallout 3 for twenty bucks. I thought it was a steal. Then I saw the GOTY edition.

I've already nearly completed Fallout 3--but if I buy the GOTY version, and play that disc instead, will I be able to keep playing my same character? Or do I have to start over?

Yeah, with the GOTY Edition, you'll get 2 discs. One for Fallout 3 and one disc with the DLC on it. Just install the DLC with the disc and your good to go.