Testicular pain-dr says it's normal?

am 15 year old i had testicle pain since 12 Year, when i only walk or doing sports but when i sit after 5-10 min pain is gone..when i was 6 i had inguinal hernia,but the pain occured maybe 4-6 per year,
i went to my doctor he sayed thats its normal to have some pains,i dotn hawe lumps or anything like that,i am thinking only about cancer help me.