I was hoping I could have some reccomendations for books that focus on the orthodox belief, and i'm hoping it will really give me the orthodox mindset. Even books written in serbian will be fine, for you serb members on this site.
I fully and completely understand your sentiments, but.....
you will never acquire an 'orthodox mindset' by reading.
This mindset is acquired through living your life in the Church; praying and fasting, worshippping and experiencing the Church and her members.
You're not the only one who has tried to do this, and that's why I'm telling you: an orthodox mindset is acquired through experiences, not reading.
Still, given that you're starting out, The Orthodox Way
by Bp. Kallistos is a decent start (I much refer it to The Orthodox Church
). Reading hagiographies is also recommended (something more intense than the Poulos series, though). The cool thing about reading of the lives of the saints are that eventually you will find one that speaks to you, and you profit immensely from this experience---learning how this saint lived his or her life, and struggled.
Remember, though---speak to your priest and keep in contact with him during this time! It is these experiences you will find most profitable.