cnrcpla you have your whole life to ride... but a short window to get an education. Take it from me, an education is something no one can ever take from you. I went to college right after high school, and yes my riding days were put on hold. The reality is to you it seems like a loooong time, but its a small part of the rest of your life. Lets face it, we are not going pro, no one is paying us to ride their foppers... Don't worry about the lack of ride time, during breaks, jump on the bike and enjoy it.
Get your degree, and then relight the MX fire, trust me it never goes out.