Being a male myself, I find that hard to accept. Nearly all of the neutered males that I have seen are fat and lazy. Like they have no hope and nothing to live for.
You must be talking about yourself. I think my SIX males would disagree with you. Tell my oldest dog, Jim Dandy, 14yrs,, a pit/pointer mix, @ 90lbs that or Stranger, a shep/rottie mix, @ 100lbs that, I think they will disagree also.
As for myself,,I was fixed in 1975. No problems here.