There's a lot of typos and errors, so I thought I would correct them for you here:
1)No man or woman is worth your tears, and the one who is, won't make you cry .
2)The worst way to miss someone is to be sitting right beside him(or her), knowing you can't have him(or her).
3)Never frown, even when you are sad, because you never know who is falling in love with your smile.
4)To the world you may be one person, but to one person you may be the world. (love this one, read it in a fanfic once)
5)Don't try so hard, the best things come when you least expect them to.