Well, I dont agree that this is all true, generalisations generally arent.
- your body looks worse and will never look the same/as good
Depends on how you look after it. I go running daily, lift weights and eat fairly clean - my body actually looks better and more toned now that it did in my 20s when I lived on a student diet of Pinot Grigio and pot noodles. Equally, I know people without kids who are very out of shape - no judgement of course, but I believe our bodies are usually the result of how we treat them.
*you are exhausted all the time
Yes, this is absolutely true when they are babies - it is exhausting getting up in the night, but it doesnt last more than a year or two when they start sleeping through and become more independent.
- you will never have any time to do anything
This one is just silly isn't it? I started a business from scratch when my kids were 10 and 12 and now employ over 50 people. The idea that parents are doomed to a life of "not doing anything" is very silly. Kids dont stay kids forever- they, you know....grow up.
- you will do all the mental load and your partner will do nothing which you will massively resent him for
Depends entirely on whether you are married to a dick head or not doesnt it? I know women without kids who are in relationships with arsehole men so not having kids isnt going to protect you from the chances of this happening. Thankfully, my DH isnt like this so this isnt true for us.