Maybe on account of your age, but in general, no. If you're going to act, you are going to have to portray characters who are both good and bad. It's not about you and what you think, want, like, feel, but placing yourself in the mind/body/soul of the character you are trying to inhabit. S/he may just have been trying to get you to think outside of yourself and challenge you with some gritty material.
It's not weird at all. Perhaps your Theatre director believes that you are mature enough and can take on this monologue. See this as an opportunity to show how well you can present this monologue. What a great challenge, I would do it.