Q.. I feel my situation is complicated but I'm sure it's probably really simple?
A. It is. You are an Indiana resident and as such must file an IN resident tax return. Almost all out of state students are still residents of the state they came from, particularly if still a dependent of their parents back in the old state. Nothing you described ( even "never lived there during the year") would alter that rule, in your case.
You report all your income on your resident state return, including the income earned in the other state. Your home state calculates tax on all your income, but gives you a credit, or partial credit, for tax you paid to the other state.
When you worked in a state without an income tax (e.g. Florida), there will be no credit, since there was no TX tax. In other words, having worked in a state without an income tax does not get you out of paying state tax on that income, to your home state.
