im afraid that my son has autism.

im afraid that my son has autism. He is now 1 yr and 7 months but dont respond to his name all the name. He also dont want to be around or go to other people except me and his father (parrtly because were the only one whos always around, we dont let him out oftern), he can follow instructions like clap your hands, bless, sometimes he does but most oftern he dont. The only word he can say right now is papa. Do you think he has autism or just delay development or is this normal? Thank You.