Is it bad that my laptop fan comes on everytime I use it?

Being usually a quiet machine, although it's normal the fans get started after some usage I see here several options:

• You use your macbook for fairly demanding tasks
• You are a person very sensitive to noise and use it mainly in silent environment
• Some undesired task is started up using consistently a high percentage of your processor.

In case the latter seems to you the best explanation, when fans start you can open Activity monitor you will find in Application/Utility folder. Select from menu to show _all_ processes running and see what's using most CPU.

That will give you a clearer picture on what's happening and might answer your question about fans.