Lately I've been feeling like I'm a terrible person.
I'm sorry to hear that, what has been making you feel that way?
I'm not really someone who is easy to get along with and I can be pretty manipulative.
It's good that you can recognize the behaviors you have that needs improvement so you can work to correct those behaviors. However, you shouldn't consider yourself to be a bad person as that can negatively affect  your mental health and ability to improve yourself.
I'm doing this just to see if you read all of the answers I give to you.
Well I am all ears, and I'm here to help you. Again it's very good you realizing that you have these faults in your personality. If you can't work on them yourself, therapy could be beneficial to you.