I lied about having an addiction
That seems very odd. What addiction you lied about?
I pretended to my friends I was a serious drug addict.
Drug addiction is a serious thing. It's wrong to lie about it to your friends. Eventually they're going to know that you were lying.
I know you are right but I needed them to give me pity. It's working better now that they know my story I am getting sympathy from them.
It is a deplorable thing to lie to others just so you can gain sympathy. If you really need love and affection, then you should give out love and affection to others instead of manufacturing one by lying. If you do not stop your ways, a lot of people may get hurt and betrayed, and you will end up will even less sympathy from others.