Hi Karan - it sounds like you certainly keep active and are doing a great job at training consistently!  The mechanisms behind gaining muscular weight and the effect protein has on those mechanisms is rather complex.  To try and really simplify it all, we can look at it this way:

1)  Intense exercise fatigues a muscle to the point where it (purposely) gets damaged

2)  Proper nutrition (micro and macro nutrients) including higher levels of protein provide our bodies with the resources it requires to repair said damage

3)  REST - sufficient rest of the muscle while in an enviroment flush with the necessary micro and macro nutrients will allow it to repair, recover and rebuild so it can be ready for the next bout of exercise

Whey protein is an excellent, high quality, fast acting protein (easily digestable and quickly available to your body) that many use to supplement their protein intake.  I highly recommend a serving or two every day.  It can and should play a role in your quest for building muscle mass however, there are some more areas you should consider before just adding a couple servings of whey to your diet each day. 

I enjoy writing about these things in great detail at www.dietforadollar.com  Some of the body transformation information I've put together may be useful to you.

Before adding the whey, make sure you know your approximate BMR or how many calories your body needs each day.  Determine an appropriate macro nutrient profile for your body type and allocate your daily calories based upon that profile.  As you determine the amount of protein intake you should ideally have to achieve muscle mass gain, you can then factor in how much whey you should use and when to take it (the best times are typically upon waking and after a workout session).

I hope this is helpful to you and I wish you the best of luck with your goals!