My friends (26, and 27) who are balding are making fun of my hairline

You have kept your 5 year-old hairline. Don’t feel bad, assuming you are the same age as they are, you will be in the category of people like Bill Clinton who kept his 5 year-old hairline into his early presidency. The juvenile hairline is rounded, concave in shape. All boys and girls at the age of 4-6 have this hairline and you were fortunate to keep it. Maybe you will become president one day. Tell anyone that makes fun of you that you and Bill Clinton share the same hairline, that should be on-up for you.