Great compromise.
If you are serious about your interests, the best policy wonks, watch dog groups, real estate development companies and innovative new products need legal support. Or a law background is really respected in DC etc.
Realistically to be a government or public policy major with big upside you should perhaps offer to go to law school.
Perhaps a career that entails a prestigious and marketable (in environmental and govt policy world’s) degree would make your parents happier. And supportive.
It will let you delve into your subject area.
Heck you can be an English major and govt minor. Your advisors and the transfer process would be available to you. Even with your grades. They might be really supportive.
When you start excelling it will make them happy and you will have time to see where you would like to go.
Tell them you want to be lawyer focusing on environmental issues or part of the advocacy and govt world. Maybe the first Indian American governor of your state on an environmental platform. Who knows.
Be creative and realistic. A BA in govt needs a little oomph to make it in the real world of environmental policy and politics. A law degree will open many doors and perhaps solve your dilemma.