Is 21 too early for a mammogram?

Ab

I am 21 and have large breasts(36G/H). They have been continually growing since puberty. I’ve consistently gone up a cup size every year for the past 4 years, with minimal overall weight gain. I have tried to do a self examination but overall I have “lumpy” breasts. I asked my mom and she said lumpy boobs run in the family but it still concerns me. We don’t have a history of breast cancer in my immediate family so she doesn’t think I should worry. Any advice?

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