How long will it take for my sister to fix my papers and will i need to go back to Mexico?

The FB-4 preference classification for Mexico is backlogged to May 1996, so well over 15 years. Please note that you need to determine if you can apply in the US. If you cannot, you will likely require a waiver for the long term overstay (depending on how you entered) and any other immigration violations; but the waiver requires an extreme and unusual hardship to a qualifying relative (spouse or parent). You case is not easy, consult immediately with an experienced immigration attorney.