I'm male 31, my blood pressure is 120/85...Is this too high? How can I get it down to 120/80?

It is fine! Blood pressures varies a bit throughout the course of the day depending on the activities you are doing... Unfortunately, not too many 31 y/o guys have that blood pressure these days...So you should be proud!
Ok. 100-140/60-90 is normal range. We treat if average of 6 readings over the course if 10-14 day is above this. However there are exceptions . Talk to doctor to help you clarify this.