Eating

Hi I am new to this site and wondered if anyone had any ideas on getting my 5 year old boy to eat. He has been on blended baby food since he was a baby and hates anything with lumps. He only likes 3 types of food and doesn't eat anything else other than yoghurt. He only drinks milk from a bottle. I have only just got him feeding himself. He has no idea how to chew and if something does get in his mouth he panics. He licks food and puts it to his mouth but won't bite and eat it. Help! He is at school, so does'nt eat at school either.