I got myself Jade Colossal, but girls I'm always doing something wrong when using it! I use a lashcurler and a brush before applying it but still some of my lashes are clumpy

What is my mistake? I sometimes feel I'm just too stupid to apply Mascara properly and today I saw a stunningly beautiful Moroccon girl and her eyelashes were PERFECT, each one seperated and volume in it and they seemed so long and she surely wasn't using fake ones...
Is there a trick to avoid clumpy lashes?