Trust, does it really exist?

Oh well, so much for being a new year, there's so much stress already..
I'm currently in my final degree year. There are only 2 subjects but i feel like dying already.
I'm doing action research and i can feel my head almost wanting to explode. :(
I LOVE research.. for fun, but i never thought the real one would be so difficult.
I couldn't sleep and eat well just thinking of the two words: action research...

Anyway,since it's the weekend i decided to give it a rest and cut some slack..
This girl needs a serious break!! >.<

It's been a while since I've thought about this word: Trust

I used to trust people, I used to, but that was all back in those good old days where people dont stab you at the back and use you for their convenience.
Now, i don't even dare to say that word out loud.
I wonder if it even exist anymore.
A few days back i started thinking of that fateful day when someone i was so close to abandoned me, took my for granted. How can i ever put my trust in that person anymore? I believe that was the breaking point for me. Since then, I just simply didn't trust in anyone anymore. I just go on with my life but deep down only God knows how hurt i was, and still am.

I searched the internet for the meaning of this word and it came out like this:

firm belief in the reliability, truth, ability, or strength of someone or something.

I have been troubled since, so I started reading my faithful book called " Psalms to soothe a woman's heart"
I don't know why but i always feel that when i'm in trouble the book really helps me a lot! It's like magic you know. 
For example, when i'm facing this particular problem, i would just randomly flip to a page. But the amazing thing was the psalm and prayer was exactly what i needed. 

I take it that the Lord works in wonderful and mysterious ways. I don't know what else to think. Well, it's your opinion to judge.. 
Anyway, now my problem is with trust, so here is what i got and i want to share it:

"God guards you from every evil, he guards your very life. He guards you when you leave and when you return, he guards you now, he guards you always." -Psalm 121:7-8 MSG

Prayer: God, you know how difficult and upsetting my situation is. Help me to trust you in and through this. Nothing is impossible for you, and so my heart will rest in your care. Amen

I'm no saint and I can frankly say I could and perhaps am one of the worst sinners in the world. But in my sinful heart, there's this hope that prays for God's mercy to forgive me and that i will be the person he wants me to be.