HOW CAN I CONVINCE MY MUM

okay 12th grade n preparing for jee but ive never beein interested in a corporate job btech cse or wtv the trend is..ive always been an ambitious person an adventurous one who wants to do something different..NDA/army/airforce attracted me but my mumma was like "ur just 5'2 n a girl n eye power or wtv..lasor nahi karwayenge ham" then i was like, how about merchant navy...would that work? my mumma was like " why do u wanna do stuff out of the box.. jee nahi hoga kya terese?" ur running away from hardwork...how can i convince her for it?! please help