What do i know now that i didn't know back then?

Time. Time is your worse enemy. Time is your best friend.Learn how to manage it. I've just now learned how to develop time skills. Most of the time i spent in high school career had been procrastinating and avoiding homework. So this year the most important thing i learned was time management skills and prioritzing. If i had mastered time skills a few years ago then i probably be wearing gold memoriabilla to graduation. Time is also an ultimate healer. Everything heals with time, pain, pride, etc. So have time on your side.