Como digo esto? ingles
:Llevo estudiando ingles desde hace tiempo, pero nunca le habia prestado atencion antes..

Question

Answer

I have been studying English for a long time, but I've never paid attention before

Answer

I'm been studying English for a while but I never paid attention to it. 
I've been studying English for a while but I never studied it seriously. (Another alternative)

:Llevo estudiando ingles desde hace tiempo, pero nunca le habia prestado atencion antes..