Hello,everybody.My name is David.It's my honor to be here today to give you this speech.My topic is "the pains of growing up".
When I was a child,I hoped to grow up immediately.However,（when i really grow up 始終覺得你的原句有問題）,how I wish I（were虛擬語氣） a child!Once we grow up,the carefree time (flows away,too.其實演講趨于口語化,我覺得可以少用那些完成時等很注重語法的句子較好).and there are so many pains waiting for us!
First （the pain of studying） comes .Exactly,studying itself is pleasant.(What bring us pain) are exams and scores.We have to study those (boring/dull) subjects(或者which we aren't interested in） and try to get high scores in exams.It's really painful.
We also suffer from dealing with others.Sometimes we may fInd that some people are hard to get along with.Sometimes we may quarrel with intimate friends.Such things always hurt our feelings.
Parents may bring us pains,too.We think they don't understand us.They forbid us to do what interests us and force us to do what we hate.They keep telling us what to do and what not to do as （if） we knew nothing.They don't really care what is in our mind.
Later,some may suffer pains of losing love,pains of working and then of supporting a family.
Growing up seems to mean endless pains,.So many people wish to return to childhood.
But you know,that's impossible.We can do nothing but stand up and overcome them,even enjoy them and shoulder our responsibilities.
My dear friends,don't be afraid of growing up!Don't be afraid of pains.No pains,no gains.Only after tasting pains can we better enjoy sweetness and happiness.Let's grow up in pains,grow up from pains.
Thank you（只找到幾處小錯誤,或不太適當?shù)牡胤?已改過來.稿子挺好的~）