HI, i'm 19 years old and weigh 277 pounds, i really need help with my lifestyle.

I'm going to college and living at home, though it is hard to eat right when my family is as big as me, and eats all the bad foods. I work full time in a grocery store, and would love to hit the gym more, but my emotions hold me back. If anyone would give me advice on how to change my lifestyle, that would be great

Also i want to take up running/ walking daily,
Thanks