Why am I the one always being taken advantage of?

I understand it's because I let it happen... but I need to get to the root of the issue on what's wrong with me.

A big executive lady asked me to help her with her project on my 2nd week of work. She knew others could do it even insisted I go ask others if I can't do it.

Now 1 month later. A coworker who never really liked me is being more friendlier because I offered them help the other week. They are now putting some of their work onto me. (I wasn't sure at the time if I was supposed to do it or not. I offered to help. My boss knew it was for them to do it and not me when I asked about it.)

I don't know I'm too nice because I just want friends and to look good at work.

Why am I the one always being taken advantage of?
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