Guys I need some tips

So.. to make it short Im quite very overweight now, i gained a lot of it ever since i started working in a call center and ofc you dont move much most of the day (have no option rn)
And I looked at myself and i cannot bare with this. I hated what I saw
So people has been recommending to do fasting. Yet heres the thing.

I still live with my parents and they force me to eat breakfast and then another meal later on the day, but its greasy food.

And if I wanna do this i dont know how to with this going on. And no, they wouldnt understand what i wanna do.

Long story short, I wanna lose weight but i need tips to minimize the damage of actually eating what they give me and still somehow losing weight.
Please.