Im scared my brother will end up doing suicide?why?

He has problems talking he can talk but he has to to therapy to learn how to speak english better.i seen on the new how kids with talking problems commit suicide because they get made fun of by how they talk or bullied and Im scared my brother might do that hes 8 years old.i have almost comitted suicide but my friend stopped me and I convinced my self to not. he has friends in school but hes moving schools now and I dont want him to be a loner.im scared how can I get over this fear?