@Rylie Hendren I agree with everyone that you're on the right mindset, but reality is much different than theory. The implementation is what will kill you. A few things to do more thinking/research on if you want to get rich while in college:
1) Rental license laws in East Lansing is worse than communism. I purchased a property on Snyder Rd last year with the intention of renting it out. Long story short, EL has very strict, expensive, and lots of hoop-jumping, to get a license. Only class 1 (owner occupied rental) and class 3 (up to 2 unrelated parties) licenses are available, and only in certain neighborhoods (verify BEFORE you buy). For a class 1 license, you must own and live in the property for 18 months before you can even apply for a license, and then the application process takes 3-5 months, $1200 in fees, and no guarantees that you will get approved for a license. You'd graduate, be married, and have a child before you can call up your college friends to see if they want to rent a room from you for the semester. The other way is to buy a house with a current rental license. Those properties are rarely for sale, and they are never sold at a discount. Just to give you and idea of how strict EL is on rentals, I placed a few craigslist ads for different rental prospects (entire family, 1 room available, 2 rooms available..etc) to see what types of responses I get. Well, I got a call from the EL rental housing division, stating they saw my craigslist ad and that I don't have any rental licenses for my property yet. Freedom of speech and press...crazy isn't it? Needless to say, I just sold my property, took my money and ran out of EL as fast as I could.
2) Although it's the correct financial decision to buy a property during college and rent to your friends, I'd agree with Caleb: focus on school. Real estate can take up a lot of your time. The only people I know that don't spend a lot of time in real estate are people who own apartment buildings and commercial real estate, where they have full time management and their ROI is 1-5%. For residential property investments, it's a hands-on affair if you want good returns: you'll be dealing with maintenance issues, insurances, bills, collecting rent from your friends (get ready to lose friends). College is taxing: your brain is constantly focused on class and homework and what to eat and where to sleep 18hrs a day. When you do have free time, would you rather hang out with your boyfriend, or go lookup a reputable contractors to fix your gutters because water is pouring into your window? You can't call up contractors or Consumer's Energy when you finally get a break at 1am from your studies. Having said that, learn and get involved in real estate, just realize you will experience time management issues during finals and exams. I don't know about you, when I was in college, it felt like I had an exam or a big project of some sort due every week. 3.2 gpa will be a lot tougher than you think when balancing college with real estate. If you have the entire summer free, perhaps spend 100% of your time during this summer to get your property up and running before school starts.
3) Your long term goals of owning a bunch of properties and living on passive income is perfect. I had those same goals, and that was the very reason why I got involved in real estate in the first place. Again, reality is a bit different than theory. You need to crunch the numbers more carefully and you'll see why.
When starting out, your options are pretty much limited to single family homes (they're cheaper and easier to acquire than multi-family, easier to finance, easier to sell if you made a mistake..etc) Each single family property in the Lansing area, on average, yields a net profit of $400- $600/month. Assuming you're a successful college grad, you could make $4k/month after taxes. That means you need to own 10 properties, free and clear with no loans to break even. And that's you working and managing those 10 properties. If you get a property management company involved, good luck, your business will not thrive as much (if at all) as if you were doing it. No one cares about your money as much as you do.
With all the challenges ahead of you, I still think real estate is the way to go, especially AFTER college. I made the shift from being a software consultant to real estate and I wish I had done it sooner. Running a business isn't for everyone, but for those who do like it, the yields are incredible. It's a lot of fun and a lot of money once you get over the initial learning curve that yields a lot of mistakes and pain.