The [F]eeling

On Thursday I'll going to buy a violin. [I'm so excited]. I always had a strange [feeling] around [violins], a kind of magic, but I never gave [much] importance to it. I [don't really] know why [I didn't]. When I was young, I listened [to] classical music all[]day. [It was especially relaxing when doing] my homework, and [before sleeping]. [Most of the time] the music [summons up] stories in my head. [It feels] like a little secret that nobody knows[, a spark of happiness]. [It provokes] a mixed feeling in my chest.
[Though] I'm a little [wary of doing it], I'm going to spend a big part of my savings to buy it. Then, since I'm unemployed I will] surely take some classes. I can't resist [the urge to buy it] anymore, it's [a pent up dream that I must fulfill]. 

I love violin. It's one of the [best ways] to share a [deep] emotion. A happy melody, an incredible melancholy or painful senses [convey deep emotions to the listener]. I [play the piano also, but I don't get the same kind of feeling from it as from the violin]. 

I hope my choice [turns out well.]

Your ideas and words are wonderful, but your grammar needs improvement. Keep going!  

The feeling

On Thursday I'll I'm going to buy a violin. I'm so exciting excited. I've always had a strange feel around the instrument, a kind of magic, but I never gave importance to it. I really don't know why. When I was young, I listened to classical music all the day. Especially to do my homework and go to sleep, it was relaxing. And in the most of cases (even now) the music generated stories in my head. It's feels like a little secret that nobody knows, a spark of happiness. A mixed feelings in my chest really is really what it provokes.
Thought I'm a little scarred to, I'm going to spend a big part of my savings to buy it and surely to take some classes and considering that I'm unplayed (did you mean, considering that i've never played?", doesn't it won't sounds so good. But I can't resist anymore, I think, it's like a passion that needs to be explored drive (pulsión) that has to be revealed.

I love the violin, I think it's one of the most powerful instruments to share a deeper emotion. Since From a happy melody, to an incredibley melancholy or painful emotionsenses. I really don't feel the same about any other instrument, may be the piano but not in on this level.
I hope to I don't fail in my choice