I did a break on plaiyng fallout new vegas, the reason for that was that i couldn't change my relationship with the npc, so i don't remember exactly what i did, but i remember that it started when i killed some woman in the Hoover Dams NCR bunker, she gaved me orders. From that on they all tried to kill me and i guess i wasn't been able to regain that relationship, so i used some sort of cheat code which only made the relationship neutral, but they still fire, i guess maybe she was some sort of a leader or something.

Please help me, i really want to end this game! Id be grateful!

Why on earth would you do that?

Sounds like screwed game to me. Can you revert to an earlier save? I mean, not only did you make yourself hostile to the NCR, but obviously you killed an (more or less) important NPC...