I imagine- the fact that you're annalysing your own behaviour to see whether you are at fault means you care enough to not be a bad person- so- that puts you more in the good bracket I would have thought.
Can you think of particular instances where people have said you have been manipulative? Then maybe ask yourself honestly- were you being honest? Did you exagerate things to receive pity, or to get your own way?
I have to say- I grew up with a (suspected) narcissist. They told so many lies about me to parents, teachers, friends. They constantly played the victim and blamed me. My life was hell at that point. I realise that makes me sound like I'm trying to be the victim. Now, I think I was. At the time, I was just confused and scared.
I think if you really do want to try this self introspection and you're really not sure- you probably need specifics from people. Then, you probably need to be honest with yourself on why you behaved that particular way.
I think it's brave of you to face this though. We all have faults- of course. It can be really unpleasant trying to acknowledge them and change them though. I wish you luck.