I agree with @Michael Boyer there is no rush to make a decision immediately. I am a senior at UMD graduating with a CEE degree. I first started getting interested in Real Estate a little over a year ago. For about 8 months, I had the idea that real estate was all I wanted to do. However, now I am seeing that I like the field I am going into and it isn't bad idea to work as an engineer for a few years. I will be as frugal as possible to save up money and start building a real estate investment portfolio, while earning a quality income. If in a few years I don't have enough time to devote to real estate and am financially independent, then I will make the decision to pursue real estate full time. For now, I plan on it being a part-time venture ~20ish hrs a week.
I would recommend giving it another semester/year before pulling the trigger on dropping out. Although it may be a good idea, it is extremely difficult to go back to college after dropping out if the business venture doesn't pan out.