Please help me with college major/career ideas.?

You sound like me! Haha I'm majoring in architecture and love it, so I suggest you look into that, or interior design since you like materials and whatnot:) both require project managing, which you sound very good at, and it is 90% individual work yet you're around people all the time (in a studio). Also it allows for so much creativity, you won't know what to do with yourself, and you can work at your own pace...as long as you meet due dates. Both are hard, I'm not gonna lie, but they're also very rewarding. It's not like you turn in an essay and don't get it back for a month, then when you do, there's one comment on it from the prof - everything is hands on, all the time, always something new and never boring. Ever. It involves history, art, problem solving, and intuition. If you're truly interested in set design, I definitely suggest looking into architecture, because it is one of many paths you can take with a B.Arch. Not to discourage you from your current thoughts on costume design, but both architecture and interior design have better job outlooks and pay range.