I agree that grammar is boring! However it is necessary. If you learn it in context, such as reading or conversation, it is much easier because you can see the reason behind the rules.
Both Are very important if you have no knowledge of grammer you can't properly organise sentence or if you don't have your vocabulary increased. You can't properly communicate your thoughts.
Your question should be something like this:
Which do you think is more important: knowing grammar or vocabulary?
The answer is - both. You need both grammar and vocabulary to learn a language. You have to learn them together. Take some lessons, beginning with simple phrases using basic structures and everyday words. Then build up your language ability little by little, developing your grammar knowledge and widening your vocabulary as you progress.
While you're reading something that is interesting to you, you're learning grammar and vocabulary at the same time.
That's right, just learning vocabulary is really boring, for me too (~_~)
I would prefer learn grammar while I'm reading and, during that process, I'm learning a lot of vocabulary as well.
Maybe you know about "Wordreference", but, it's a useful website, I use it a lot, because I can hear the sound of the word that I looked for, (there is a app by mobile, too)
Grammar is only boring if you study it on its own. Studying grammar on its own is the same as sitting at home learning the rules of football but never playing the game. Of course it's boring and pointless. You need to connect what is in your grammar book to what you read and hear in the real world of English, and to apply those rules to what you write and say. That's when it all becomes interesting.
And, if you don't mind my saying this, Salih, you do really need to concentrate on your basic grammar. If you don't, you will never be able to express yourself clearly.