I am still trying to explain why i have rejected many jobs to my parents.
Because i know what i want from life and geting a job may just stop me from doing all that. Will my parents ever understand. We hopefully in the future

After doing job for 3 years, I decided to do freelancing full time ( with job I was doing freelancing but sometimes I get 1 hour, sometimes 2 hours or not a time at all). I decided but it's important that my parents understand the same. I thought it will be too hard but when I discussed all things with my parents that what I am doing at current job, what I want to do and all - my parents simply said that do whatever makes you happy. I was shocked at that moment (my parents were supportive all the time but I thought they will not agree with this because we were not that good financially). I left the job and doing freelancing now.

But same situation not worked with my cousin brother as his parents not supported him and he doing the job.

Wish you great success and I hope your parents will understand your situation in future.
Even I am sure that they will understand my friend :)