Over the counter drug that would easily kill me?

we seem to live the same exact life, except i see every day as beautiful. trust me, it gets so much better. high school sucks. i failed most of my classes, i still can't do simple math like 9+8. life gets so much better after high school. please believe me, I'm 18 too and graduated from hs last year. it's the little things in life that make you happiest. set tangible short term goals for yourself. it's amazing once you reach one. it makes you strive for bigger and better goals. i attempted suicide by overdosing and i realized after i took the pills that i did not want to die. i've been where you are, i want you to be where i am. you'll see it gets better. everybody deserves the happiness i've found