Well, i'm very interested in game developing but i just don't know where to start, recently i've been programming in java but i don't feel like its the right language for what i want, i don't plan on programming 3D games, i want to create simple 2D sidescrolling games. So, which is the language i should use??

Why do you feel it is not the right language to create a 2D sidescroller? This has been completed many times in Java. If you are not sure where to start, a sidescroller is not the best idea.

Have you started learning one of many graphic libs for Java and created some simple programs moving shapes and loading sprites? So my answer to your question as to which language you should use is - Java.

EDITED: It is not the language that is limiting you here, its your ability and understanding of the topic. Either proceed down the route with Java or pick a similar approach using a game engine like GameMaker.

I remember my first "game" was in Basic. It was a little hockey type game. It was so horrible and slow but it gave me the knowledge of game loops and other ideas involved in games. Don't worry about performance right now. Use Java's built-in gfx functionality first. I would say make pong first as it'll help you understand the basic functionality of some core game concepts.

I'm a big advocate of a mentorship. A good number of people will just say read all you can, which is always good, but there is something about finding a mentor that helps you learn some of the tricks quickly and efficiently. Something that might take you months to learn or come across (or fully understand) when you just read can take a lot less time if you have a mentor.