Yes. Don't limit yourself, move is a move. You can always look at things in different ways:
One way is that you make a move, which turns out to be wrong and you'll feel ashamed. You'll give up because of that feeling shame. What do girls think? Well, he tried to flirt once with one girl, and he gave up. He is not a winner, he has low self esteem, he doesn't feel good about himself. He doesn't have any confidence, he is seeking approval. Do I want to be around that guy? Nope.
The other way is, that you make a move and it also turns out the wrong way. But you don't feel ashamed, you laugh and you focus on different girls. What do girls think about you? Perhaps they don't even notice that there was something wrong at first place, you are simply flirting with other girls. They may think: This guy loves girls, he talks to lots of girls, maybe he is not the best at this time but with more practice and experience he will become good. He's got confidence, he doesn't give up so easily, he doesn't care if others laugh at his effort to get a girl. He is a winner, he is trying and trying until he wins. Do I want to be around this guy? Maybe, and even if not I can recommend him to my best friend.
Another way to see things is:
* "I am in a small high school" >>>> You are limiting yourself. How many girls are there? 20? 100? So say: There is only 20 (or 100) girls to flirt with! Once I'm done flirting with all of them I will need many more girls! (this will give you good start with Abundance Mentality)
* "The wrong move can spread like a wildfire" >>>> And that is good! You are not afraid to do wrong move, wrong moves are part of growing. You are moving forward regardless of what others think, regardless of making bad moves. That is the way of success, that is how successful people did it. Let those wrong moves spread like a wildfire, let everybody know that you are on your way of success.
* "Would you bother with flirting with girls or would you focus on studies and doing hobbies?" >>>> Yes. It wouldn't bother me to flirt with girls at all. At the same time you can still focus on studies and hobbies. It doesn't have to be Either/Or, it can be BOTH.