As long as the b is healthy, being fat or thin does not matter. Imagine what the mom of an abnormal/silk b will feel like. U are lucky in comparison.
As for the freedom and wealth of being single. U gain some and lose some in life. Your single friends will be very lonely in their old age. Money cannot buy her company, but u will have kids and grandkids. Surely, your kids bring u happy times too, not just burden, right? Try to give yourself some quiet time alone each night, even 15 minutes reading a good book or listening to music to relax.