I am at my wits end. No idea what to do anymore.

My son is 6 and seems like he has a split personality. At home, he listens and is very good. Always kind, polite.. completely different to how he is at school and around children. When we go to soft play, he always (and I mean always), cries saying X and Y are horrible, X is playing with Y and He does not want him to play with anyone else... then he cries and kicks off and just completely embarrasses me in front of everyone. EVERY single children are playing bar him. One little thing that goes wrong, he makes such a HUGE deal about it and in the end, I have to get out of there. Never at softplay for more than an hour.

At school his behaviour is something else as well. He is always getting angry with other children, always hitting out and cannot keep still..  generally very unsettled. I have tried reward charts, talking to him, just having a one on one proper chat about how he feels... nothing has worked. He cannot sit and listen to a story so they take him outside to run around at the end of the school day. If someone else he is playing with, plays with another person, he gets grumpy/angry. If he is around other children outside or at school, then it makes my life an absolute misery because someone always says something ie he has hit someone, he shouted, been mean.

With both his dad and I, he is different. With other adults, he is different. He does not seem to enjoy any child of his own age, company. He only likes company of us or other adults.

The school thing though, I cannot stand it. I am getting called all the time about it and he starts crying and screaming as soon as the teacher calls me over because he knows she is going to tell me he has been naughty. I try my best to discipline by explaining what he did was wrong and he is not going to watch TV or play on his PlayStation. I am stern and I am doing my hardest. We read books about how important it is to be kind, hands are not for hitting, you must always help, be kind.. honestly every day I am explaining that all of this is so important. But the following day at school, I get called in again so it never works.

They evaluated him at school and there is nothing wrong with his speech and understanding.. he knows exactly what he is doing. So they have called in an educational psychologist and waiting for them to assess him for that. Otherwise I am literally all on my own. I don't know what to do anymore. Deep down he is probably autistic but what can I do then? Changing schools not an option because I do not want him to feel like he is different from the rest of them.