Areriel,

Choose the top brands, companies and entrepreneurs you love, then work like hell to get on their radar for an internship. If they don't offer one, make one up for them.

Be persistent.

Most people give up too early. Keep calling and sending follow up emails until you get the answer you want.

Get experience.

Even if it means delaying or dropping out of university to accept a position. If you want to be in marketing (I agree with John Ramey re branding vs exec), having experience working in real companies on real challenges with fantastic mentors will be a far better teacher than textbooks and a significant capital investment in a degree.

Finally, leverage your biggest asset: your inexperience. People love someone who is young, full of energy and curious to learn.

Don't wait till you graduate. Start now.

Be bold. Do something unconventional. And I promise you Areriel, you will find what you're looking for.