I have had 3 c sections, and am due my 4th in March so don’t worry about not being able to have a big family. They do recommend not getting pregnant quickly afterwards though. My kids are 12, 10, 6 (and soon to arrive).
As for your stomach, it will go back down. I’ve been pretty lucky in that it has gone flat again after each one (it took longer and longer each time). I know some women who had csections who were left with a very small ‘shelf’ (I don’t know how else to explain it), one hated it so much she had a mini-tummy tuck to get rid of it, another loved hers and saw it as proof of her motherly bad-assery. There is no right or wrong way to feel about it, and fuck anyone who judges.
I would strongly recommend a belly wrap to help support you while you recover. I found they gave me loads more confidence to start exercising again when the time came, and I credit them with helping me flatten my stomach out again (I started wearing mine very soon after giving birth though).
Take it very easy for now. It’s easy to think you’re more recovered than you are and overdo it, and then pay for it for a few days after.
As other women have said, VBACs are common (I wasn’t allowed because my babies were so big) so one csection doesn’t necessarily mean you’ll have to have another.
Congratulations on your little ones arrival, and be kind to yourself (especially while you recover!).