anyways luffy, it isn't impossible to make friends... maybe you're not looking at the right place
i only really have 2 girls that i would really consider my friends... then the rest are boys xD both older and younger than me, but i don't have any my age.
lots of people feel alone, it's pretty common. there are the people who are physically alone, and the people who are surrounded by others that they feel don't even care about them. it's sad, and i wish it wasn't so, but that happens a lot. nearly everyone has some aspect of life that they can relate to yours.
just be extra nice, i know it won't be easy at first, but if you start treating people even nicer than they deserve, it becomes easier. plus it'll make you happier.
once you give up on trying to force yourself to be happy, and actually start focusing on others happiness, it will help
and you'll actually be happier.
we do care about you here... but maybe you should just talk to someone when your slightly upset so that you don't let it boil up... because i know how lame it feels to let something boil up inside you... anger makes me sad
we just want you, and everyone, to be happy and feel like they have a safe, happy place.