@Catalin:
I like your mix, it is soft and warm. The vocals stand out a lot, since they are the only clear thing in the mix. Adjust the level there.
Download lame.dll or lame64, depending on your system/reaper version and put it into your REAPER folder.
Now you can encode into mp3.
Try to stick with reaper plugins for now, I am sure that you do not need 95% of your plugins to make a good mix. Also we can see what you did and learn from that. If we work in the same "world" things are much easier and as we see above we have people delivering excellent mixes with reaper-only.
But since you are learning your stuff - what exactly are you using and what for?
At last - here's your mix in mp3.
box.net