I bet a lot of people have "friends" who get locked into life with tunnel vision. Usually the people around them think its a bad thing.
A great aspect of setting goals is getting tunnel vision on the things you want the most. Many people wont understand why you are doing what your doing and might even think its not a good thing. Example "oh she is eating that "new" paleo diet thing...... It cant be good?!* She has to be missing out on life. You know?"
Brush off all the nay Sayers, set some goals, and lock and load with LASER VISION!