This makes me think that your parents may not have a good handle on current college $$ (lots of us didn’t when we started looking at colleges with our collegekids- both costs & financing have changed a lot since our day). Private schools can be more affordable than public OOS schools. You need your parents to be clear about how much college costs these days, how much (if any) need-based aid would be available to them, and how much they are willing to provide. You can only borrow ~$27K total over the 4 years in your own name (they have to co-sign for any more)- and you really, really want to avoid it if at all possible. @tsbna44 is right that it takes a while to get to the well-paid jobs, and the costs of living in a city (where most ad jobs are) are high.
You don’t need a specific “advertising” major to get into the advertising field- marketing is just fine. Internships are the key (more than the name of the college), and they are competitive right from the beginning.