Use may/might, could, must or can't.
Dear Unhappy,
You 1).........can't......... be serious about leaving home!. There 2) .....................be some problems with your family, but there 3)............ be another solution. You 4).............................try talking to a friend or a relative. You 5)..............................have some aunts or a cousins who can help you. You 6).............................find that discussing the problem all together is better. Your parents 7)..........................really be as angry as you think; they 8).....................................be upset but they 9)..........................................realise why you're so unhappy. I suggest you try talking to them again-you 10)...............................be surprised.