How can I speak with more clarity and confidence?
well there are some good and proven ways to overcome such situations.
有很多好的和久经考验的方法去克服这种情况！
1.practice a lot , whenever you are alone in your room try to speak loudly,read newspapers loudly and try to pronounce every word clearly.begin slowly and increase the speed as you get along.
经常练习，当你独自在家的时候试着大声说话，大声地读报纸并且清晰地发出每一个字，先慢说，然后尽你所能地增加语速！
2. read different magazines,articles,blogs,books to increase your vocabulary
读各种杂志，文章，博客，书籍去增加你的词汇！
3.This is my favourite. when you are going to bed plug in your ear phones. make a file of good English songs and listen them while sleeping . don't turn it off, mind it it should be playing until you wake up in the morning,volume should be less though.how it helps is it improves your listening skills. when you are sleeping your brain adapts to the music,rhythm and the words.this way you will never have problem with words.takes a little time though.
(EDIT- option 3 is a personal choice.if you are not comfortable then don't do it. instead I would like to suggest to listen to songs whenever you are free)
这是我最喜欢的，入睡之前插上耳机，下载一组好听的英文歌曲，在你睡觉的时候听它们，不要关掉它，音乐将一直伴随着你直到第二天清晨，尽管音量小，但这样会提高你的听力技巧，当你熟睡的时候，你的大脑适应着音乐，节奏和歌词，这种方法对积累词汇很有效，尽管只是一会儿！
（第3点是个人的建议，如果你不适应你可以不做它，那么我建议在你空闲的时候听歌）
4.stand up in front of the mirror and talk to yourself,its a crazy idea but its really effective.even steve jobs used to do this and its a proven way through which you don't get nervous at the real time.
站在镜子前面跟自己说话，这是一种疯狂的想法，但是它真的很有效，就连史蒂夫乔布斯曾经也做过，通过这个久经考验的方法，在现实中你就不会紧张了。
5.always be active.interact with people,talk to pals,participate in debate,sing aloud.
总是主动地与人互动，和朋友交谈，参加辩论会，大声地唱歌。
don't be afraid of anything.why do u fear?is there anything to lose?we think that we fear but that's partly true,we actually feel we cant do it.but ever asked yourself why cant i do it when others can.remember this quote:-
"THE WORK IS HALF COMPLETE WHEN YOU THINK YES I CAN DO IT".
不要害怕！你为什么害怕？什么东西要失去了吗？
我们认为的害怕，在一定程度上是我们觉得我们不可能做到，你可以问自己：当别人可以的时候我为什么不可以？记住这句引语 ‘当你认为可以的时候事情已经完成了一半！’
there is nothing like i cant do it. yes u can do it. you can do it.you have the potential,but you have not tried hard enough.if you really want to overcome this situation,give this methods a try.u can do it,just remember this.
没有什么是我做不到的！是的，我可以做到！
你潜力无限，你只是没有尽力去尝试！
如果你真的想要克服这种情况，尝试这些方法，你可以做到！铭记于心！
文章来自：quora
文章作者：Abhijit Mishra
我开始尝试翻译我喜欢的文章，在此分享给具有进取精神的你，如有不准确的地方请诸位见谅！
