Christians what do you say about this?

Ok i was a very strong christian during 8th-early 9th grade as well as being social, also i had good grades. But i remember last year, a pastor prophesied about me having very tough times in the future and i have to be strong.During my late 9th to 10th grade the thing was that my dad died even though i barely knew him(because he was divorced for a reason),my friends started moving,i hated ppl in my school and started skipping. Overall i skipped 20 days in 1 marking period. My grades have been plunging and I didn't join any sports team this year.I've began to somewhat begun to be neutral with god(i thought i was fine if god wasn't in my life) or a phase of atheist.Instead of you bickering to stay faithful or pray It's not easy as you can think, of course i tried but I've became depressed and I'm really anti-social(i pray 3 times a day but its nothing that important i just thank him for the food,sleep,etc) Religion is not a simple game where you just pray and everything will be fine, i just need something to pick up me. So if any person(mainly christians) went through this and overcame it please guide me to the right steps so i can be happy once again =)