Why pick on me?

I am a good worker. I know that. I always earn my salary. I never try to waste my time. If I am not doing anything official, I shall spend that time for self learning. But I have some people around me who try to pick me. Rather prick me with a pin. The pain would be there. But there is no bloodshed. It hurts. That is important. But the people are thick skinned. They get fun out of teasing me. They make my life miserable by pulling my leg. They do all sorts of things to instigate me. They insinuate a lot of things about my work. They try to bad mouth me. Still I am surviving because I have faith in the unknown power who is holding my hand and leading me through all this rut. But can it continue for this long? The boss believes the words carried by the colleagues. I have no voice as far as defending myself is concerned. Why should I defend? For what I have to defend? I have not made any mistake! The boss always thinks of some or the other plan to needle me. I don't know what the boss gets out of teasing me or trying to needle me. I do not get intimidated easily. I shall see what next is being planned to make me miserable. I shall wait and wait. I am sure I shall get an opportunity to get even with all of them. But I don't want to hurt anyone. This is the dilemma. But a question. Why pick on me? Is it because I am soft?