People just want different things in life, you just need to find somebody going the same place as you, and there are plenty! Above all don't lose sight of God, keep the main thing the main thing. Prayer is a powerful weapon, a free one too!
It's important to be cautious of the enemy as well, he will use this chance to sow seeds of resentment, anger, frustration, doubt and low self-esteem. Look at it less as men turning you down for not wanting kids, and more so you both realising you want different things in life. I'm sure they find it difficult to turn you down over this, just as you feel awful with them turning you down.
I know as someone who really wants kids how difficult it would be to turn down someone who I enjoyed the company of and knew knows Jesus. However, God has put a family in my heart, and unless he puts that person above that desire or removes that desire, I can't really compromise on it.
Many men want kids, but many men also don't, it's just a case of prayer, faith and persistence to find the right one.
As for the weight, honestly, if someone cares that much about your weight (Which isn't that much considering I'm a much bigger guy), you really don't want to settle with that person.