..I spend about 2 hours a day...for studing exercises..my first question is:2 hours a day is enough???
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Depends on HOW you are practicing. Especially when learning to play an instrument. You need to learn how to learn - sounds a bit strange, but it isnt. You can practice 6 hours a day and not improve anything if u practice wrong. And if you have a good plan you can practice 1 hour per day and it is more than enough.
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..which is scaring me a little..is that i don't know if one day i can play this kind of solos which are really fast..I'm afraid tha i'm not gonna make it..
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are you under preasure? did u promise to play an e-guitar concert next week? Chill - dont be afraid of failing - cuz THAT makes you fail
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And the question is:Is there a some kind of magic which make you a perfect guitarist???
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yep - everything you need is in yer fingers, yer head and most of all - in yer heart
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What make you better except from practice and patient???

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Practice and Patient :D