I think if you show you've learnt from your mistakes and what you did wrong, they'll consider you for a mentor position. <3, so definitely never lose hope. I think you have :3, so I'm positive you can still become one if you choose to do so!
I see you became a mentor for 4th Generation, not too bad for someone your age.
I would consider mentorship in a few years, when I go for a long time without breaking rules lol. I would probably consider the Trivia boards and Black and White as my ideal sections to mentor new users.
In my noob days I broke the rules a bit so I may not be eligible for now lol. Maybe in a few years though.