whey protein recommendations

I am 15 years old and i am hooked on whey protein simply because (I think)it tastes good after my workout and it speeds my recovery with fast digesting protein. I get EAS 100% whey protein and only take it after my work out. I am wondering if it is true that the whey can get "stuck" in your kidneys or stomach area and create a "bloated" effect. I fear having a bloated stomache. I am also wondering about the quality of the whey products. I got the EAS 2 lb for 11 dollars. What is the difference in quality between my $11 whey and the $45 whey i can also find on line? Any recommendations?
 
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