Son is not growing up :(

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It’s a catch 22.
My son is 11 and although I have brought him up to be kind and caring which he is I now need him to be ready for secondary school.
He’s more like a 8 year old.
He won’t play fight and cries when someone tries
He still likes to watch cartoons
He won’t try any tricks on scooters or bikes because he’s scared
He won’t climb a tree because he’s scared
He’s scared to stay at anyone else’s house other than his dads or mine.
He cries when he falls over
He cries when he’s emotionally upset
He won’t play football or any sport for fear of being hurt

I live in a cul de sac street where everyone knows each other. Everyone has kids. It’s great. But he only plays with the younger ones and not his age.
He is in a group on WhatsApp with all his school mates but won’t engage in conversations. He only reads them.
What do I do?
Although I don’t want him to grow up too fast I kind of need him to so he is ready.

I do have to say I thought ASD too. Maybe take him to your GP and get on the waiting list for a referral.
The signs that would concern me are: crying a lot over little things, no real friends, hanging out with teachers and TAs at school, he's scared of a lot of things.
I wouldn't panic but I would ask his new school to keep an eye on him, and maybe ask the SENCO to put him on the SEN list, just so they keep an extra eye on him.

The playfight thing is rididulous op...who wants that really? You sound more immature than him.

I dont mean that unkindly