What is considered to be 'too nice'?

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Even though I would never admit this if I were to meet any of you in person, I'm a pretty nice guy who helps everyone. A few years ago, I probably didn't notice how helpful I was to anyone who asked: if someone was in need, I did anything and everything to help them, not for personal gain but because...well I'm not sure why. Now, I'm in college 1000 miles away from home, I have a job, and I have a lot of friends. My university is one that is considered by many international students as a nice, safe place to study English and so about 99% of my friends here are from Asia (typically South Korea, Japan, and Taiwan). My first year here, I was very willing to help out those who were new to the U.S. I've made many lifelong friends from my 'good biddings' and I continue to keep in touch and have even visited many of them in South Korea. This school year, I have a different persepctive. It seems that I've made sort of a 'reputation' for myself within the University for international students as someone who is nice and will give rides, lend money, and just give help in general with anything needed. I've also noticed that many people just take advantage of this; from some of these people, I'll only receive calls from them when a ride is needed. Others rely on me for editing english homework or for helping out with changing cell phone plans, contracting new apartments, or sorting out plane tickets. You get the idea. How do I draw the line to this? Stop answering my phone? I realize what I'm doing what it's harder to put a stop to it than I thought..