I agree with you Fox. I feel like a burden as well.
It's part of the mental state that makes you see just the "cons".
Try making a pros and cons list of telling someone how you feel.
It's a mental exercise to force your brain to think the way it doesn't want to.

You can't be a burden to someone who cares, and if you still feel that way, try telling someone you pay. It's their job to listen.