I've come to believe that I'm a narcissist.
That's certainly a peculiar conclusion to come to. What makes you say that?
I tend to just ignore other people feelings and desires, and I also noticed I find validation in how others percieve me.
I'm really shocked you were able to figure that out about yourself and I'm proud of you for it. Now that you've figured that out, I think getting some professional help would do you some real good. It'll likely help you to be more empathetic and understanding towards others while also helping you not rely on others for validation.
You don't think I can change on my own?
You might be able to, but it will be much easier if you try to change with the help of a therapist. Doing things on your own can be tough, and a therapist is trained to help people overcome their narcissistic tendencies.