but people say when someone likes you it's for the one on the inside...
Well, whoever told you that is selling some hogwash. People do not like the person on the inside, hardly ever, first starting. The only exception is when best friends become mates.
All other times, attraction is purely instinctual. It's primal. It has no reason nor rhyme, and it has a LOT of superficialness to it. This is hard to accept, but it is critical so you don't think ill of yourself needlessly.
This is why SO much of our American culture focuses on looks. It's almost the ONLY thing you can do to sway the primal forces of attraction in your favor. It isn't fair, but it IS the reason.
So, stop beating yourself up. Unless you're willing to play like someone of the popularity game and join the banks of people out their garnering attractiveness to create opportunity for dating, you will have to do it the hard way. Through friendship.
That sounds lame, and maybe even sickening at your age, but time will eventually teach you that the relationships born from close friendships and common ground have a HUGELY higher success rate than the primal attraction crowd. Count on it!
So, stop focusing on "getting a guy" and keep focusing on being the best "you" you can present in the areas and hobbies and classes and activities where you shine. Be a star in those arenas. You will make connections and before you know it, you will have a real link with someone, something way better than the strictly primal group ever gets to start with.
Good luck.