When do u stop calling yourself a beginner and start saying that you can actually play? I've been considered a begginer since june but now i know all notes and most chords, so when can i say that "I can play the guitar."?

You can change your title from a beginner to an enthusiast if you want. But I wouldn't say you should say you know how to play until you know all your scales at the same tempo and all your chords.

If you can play chords well enough to create your own songs with out hesitation and have people listening to you enjoy your playing then your making progress. Scales are to me the main transition. If you know all your scales at a good temp and understand what your playing enough to teach someone else how to play then your past a beginner.

No one ever completely masters the guitar, and if you can play at all, then you can play. Someone who has been playing, say, ten years is obviously not a beginner no matter how lousy he is. Whether you're a beginner or not has only to do with how long you've been playing, not how advanced your playing is. I'd say you have to have played for at least a year not to be a beginner any more. So you're still a beginner, but you can nevertheless say you play the guitar--some.

Ignore the two answers above mine, and note particularly that 1) you never learn "all the chords" (there are always more you haven't even thought of) and 2) "creating your own songs" has nothing whatsoever to do with guitar ability.

This is very true. One never stops learning on their instrument. For others to consider a player a master, that player must approach every song, composition, improvisation, and performance, as a beginner, lest the player prefers no one appreciate his efforts and accomplishments.