Drop Rate

I feel like my game has a bug or something, because in the amount I have spent money and unit wise for hero crystals I have yet to get a 3 star. I can't really advandce that far in the game because of it. I feel like I am spending all this time earning and spending just to get 2 stars. And compared to my other friends they seem to be doing just fine getting 3 stars every now and then but for me nothing. I know it chance but still I feel like I am being cheated.
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I did have a drought period where it only showers dry 2* leaving me high and dry.
Luckily after I begin to worship the RNG God, give offering, sing praises and etc, I begin to get some 3* and 4* once awhile. I do wish I can get more love and have better 3*/4* crystal pull