I feel upset for you. There is not much info to go off though. He may be naturally unaffectionate and grow up into a very independant male. My daugher stood up a lot in the womb and kicked, she was very active, I dont think this counts. I only have one daughter.
I hope your husband is affectionate, as you obviously are.
As to wandering off - my daughter does this all the time, and yet in the house I cannot even leave the room, and fortunatly she loves her cuddles.
How much nursery time? If there is some, maybe it is more than he wants and resents it? My daughter used to always give me the snub after nursery from the age of 8mth old for about 10mins, it stopped at about 18mth.
How much do you relate to his world? Sometimes with adult pressures of money and work we forget what their world is like. You need to show that you understand their play and relate to its characters - Noddy, Postman Pat or whatever - in order to be their friend a bit. However, this has its downsides, of course, because the more a friend you are to a child, the harder the respect and discipline will be life-long!I think it is still worth the risk though.
If you give a little more info about the life-style, I think people will be able to help you more.
It may be that he is just unaffectionate. This is sad for you as a parent because that is one of the things tha makes it all worthwhile. It must be very hard to just give without receiving.
However, closing the door on you while he plays makes me wonder? Maybe you are too loving and are not showing that you have your own space too and that he cannot take your love for granted. What happens when we love men too much? He is just a little man? I only have a daughter, they are different. More clingy, actually.
Regress. Remember your chilhood and see what you come up with? If you try too hard to win his love he may play games with you.
I hope that you are not infused with external influences from rellies. I hope that they are on your side?
He is YOUR child. Never let anybody take that away from you. I am a bit concerned about the grandparents issues. What about you? Are you easily bullied?
You are right to ask for help here. If you try everything and still no trumps, you know that it is just his nature.
However, it does not mean that he does not love you! He will probably turn out to be a very indepedent male, very sucessfull in business, and look after his mum until a ripe old age!!
Let us know hos you get on. We feel for you with the cuddles issue!