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You're under 18. You can't be a loser because you haven't even started your life yet. At your age all you've done is some preparation stuff, getting ready for the real thing. Saying you are a loser is like going to the Olympics as a swimmer and declaring yourself a loser before you even get in the pool.
Give yourself a chance first before you decide how your life is going. People change a lot, especially in their first few years of adulthood. But people keep changing long after that. Popular kids in high school end up totally screwing up their lives and not doing anything with it. Kids that nobody paid attention to in high school end up being someone that everyone envies because of their success, things they've done, or whatever. The good looking kids age quickly and lose their looks. A plain girl in HS blooms into a beautiful flower as she gets older. Nobody cares about the popular kids any more. Everything totally changes.
How kids are in high school is almost no indicator of how well they do in life. I'm not just making this stuff up to encourage you. This really is what happens.