If you want to become a great investor. Develop the tools to do so. That means reading books on investing, listen to podcasts, troll the forums, and network at local real estate meetings and conferences. Maybe try to find a real estate office that had a lot of realtors who are investors themselves or represent a lot of investors.
I'm going to give you the advice I would give my 20 year old self. They don't teach several concept in school, so if you don't get them from your family you will have to learn them on your own: time management, finances, and taxes. Schedule every minute of every day. Create a financial budget because every dollar you spend is a dollar that could be invested. Live meagerly, some friends will get jobs and get apartments they can afford with their paycheck, but will be stupid b/c of the debt they've acquired and the fact they won't be saving that money for the future. Learn how taxes work, especially when it related to real estate.
You're entering a world full of adults, adults want reliability and consistency. Before I purchased my first home I let go of two realtors because they weren't consistent. They said they would complete tasks and they didn't. What's even worse is I had to follow up with them about it, which I shouldn't have to.
I'm not in a position to tell you whether quitting college is correct for you. This is a math equation based on what your income would be with the job you would obtain with a degree vs what you would make as an RE/investor. Also you need to include your quality of life in each equation. Going back to college is "safe" choice considering you're only 5 semesters away. But actually going to college in the first place is seen as a safe choice but often isn't. College is an investment in time and money. The investment is supposed to have an ROI in the form of a job that provides enough money to justify said investment. Most people do not calculate what this investment is worth. But you should make sure you do to understand if you're making the right decision.