Can I get my birth certificate in Hull if I was lived in another Town or State but lived here for 20 years?

No. Birth certificates do not cross State Lines, nor do any other Vital Records. i.e. marriage or death certificates. 

If your parents were living in another Town at the time of your birth, Hull will not have your birth certificate, or if you filed your marriage intentions at another Town or City Hall, Hull will not have your record.