Why are husbands always entitled to bear the financial burden of the entire family?

Tradditionally it is always believed a relation between a woman and man is that of nurturer and provider. Women were always the nurterer and man is expected to be a provider. Thats law of nature too. If you check even in animal kingdom it will be normally a male who would make the

Why does my family seem to always point out that I'm a burden to them?

That's a tough question to answer, and if they are truly telling you that you are a burden, they're doing it to make you feel guilty and manipulate you. No parent would ever tell their child that they are a burden unless they were trying to hurt them