You metioned that you are in High School. Some of the excessive arm hair my be due to the ongoing strange brew of teenage hormones & puberty. Usually it all should start to quiet down around the age of 19 or so....

If not, then when you sit out in the sun to work on a tan and vitamin d, to expose your arms to the sun for some natural bleaching.... Make sure to moisturize after wards....

Your arm hair does not say whats in your heart and soul.....