I've been working at the same place for 3 years now but I'm yet to get a promotion or even a significant upraisal. It's all because of my low confidence and inability to get credit. I do all the work but my boss or coworkers take all the credit. My boyfriend said I'm a pushover and this is why it's happening to me but then he exploits the same to get what he wants from me. How do I change this?