Half of your chess career is like 1 year. You are an 11 year old. It's a meaningless statement.
You literally just said you learned all the sicilian theory in 9 games.
There are 13 open sicilians for black, so even in theory your claim is impossible.
There are people who spend decades studying just the Najdorf alone. The fact you believe you learned all the theory in the sicilian within 9 games is just a testament to how unaware you are. Which is not a surprise, since you're 11.
Maybe by age 12 you will have developed the brain volume to realize there are limitations to what you know. But as of this time in your development, you don't have that awareness.
Every antisicilian is bad. The Alapin Sicilian is bad for White. Look at every antisicilian, then look at the advantage; it always drops. Yes, you are correct: the Najdorf is a great opening for White; however, most often the Najdorf ends in a draw most of the time. When people lose against the antisicilians, it is because they haven't experienced enough of that line, but most antisicilians are bad; even if White has a slight advantage with these, it's still less, which is bad. Also in the Sicilian, there are many great variations with the Najdorf because of the fact that the Najdorf is a deep opening for both sides to have strong ideas that are barely stoppable. But often people who know enough about the book in the Sicilian have very high levels in elo, often making stuff like the Najdorf end in a draw. Again, there have also been crazy brilliant games for both white and black with many brilliant moves, and often each has had great defeats and great wins. Though yes, white or black don't have to choose a Najdorf Sicilian; they can choose other lines, but the only other great lines for white are the nf3 Sicilian traditional line, the open Sicilian stonewall, and also, at some levels, the McDonnell attack. Often it is also a great idea for Black to keep the Sicilian closed because White's goal vs the Sicilian can sometimes be to open it up and start crazy attacks, often having Black lose, but I have seen most brilliant games with Black keeping a closed Sicilian. Often open Sicilian is better for White and closed better for Black because Black actually gets great positions where they can hop in white position and start some kind of attack. In conclusion, it's a great opening for Black if they know every antisicilian counter often leads to Black's win, and with many other lines leading to draws, usually Black only loses if they blunder or open the position.
Not all anti-sicilians are created equal. The Smith Morra is probably the worst anti-sicilian. I wouldn't rate the McDonnell up there very high, either - white may as well play a Grand Prix at that point.
Black isn't the one who chooses whether to enter an anti-sicilian or an open sicilian, that's up to white.
The Najdorf is an Nf3 "open sicilian" line, and black is the one who decides whether to play 2... Nc6, 2... d6, or 2... e6. So I'm not sure what you're talking about there either. Never heard of the "sicilian stonewall" either.
I don't know why you're trying to debate this anyway, you clearly have no idea what you're talking about... you're 11 years old. You have not even been alive and cognisant long enough to know how to play the sicilian. I've been playing the sicilian almost as long as you've been alive, at this point.
a) if white white knows the open lines they're good for white. It's alot of theory, but...
b) if black doesn't know the anti-sicilian theory it can be bad for him.
Hence it's up to white to decide whether he wants to buckle down and study very hard, and play the open lines... or go for a more practical approach with some anti-sicilian lines - but not the Smith Morra. In either case the better player is likely to win. Sicilian is one of the most classic openings in chess, it is played at all levels in all time formats.
if youv'e played the Sicilian double the amount I play chess then why am I over half your rating Im not bad at the sicilian I know quite a lot of good lines Ive studied openings over half my chess career mainly the queens gambit Jobava London and Sicilian I know enough about the Sicilian.