My parent think im gay and wimp?

Im 13 yrs old and my parent think Iam gay and wimpy cause i had not been work out during the summer yes of course i work myself out every night like my martial arts instructor told me too but my parent still consider me gay and wimp cause i have long finger but at least i can play my musical instrument perfectly but long hand=gay? i dont want to born this way im NOT gay do i feel like i like boys no but yes think them as a friend except for Hitler i want to hold a gun one day as a marine not some make up!!! please help me guys to convince my parent ty :)