How can I improve my conversation skills?

I have right frontal lobe damage TBI (tramautic brain injury) and I have impaired social communication skills; I can't communicate effectively and even when I do try I fail, I notice everyone teases me and makes fun of me; no one takes me seriously anymore and I always say the wrong things; I try not to but I can't help it, even my teachers make fun of me and tease me no matter what I say. I say the wrong things. When I went to the doctor he suspected me of having autism, he put me for a MRI scan and diagnosed me with TBI (Traumatic brain injury) and said that no one should help me, what should I do? * He also found right frontal lobe damage on the MRI and also noted it was right frontal lobe damage and noted I have a social communication disorder. I also got into a accident but I never thought it did brain damage.