开头修改 Thank you for coming here. The topic of my speech is... before we begin有点像会议的主持的开头，如果要这么说也应该是before I begin.自我介绍和我的爱好I am a down-to-earth and easygoing guy. I have a wide range of interests. In my leisure time, I like going out with my friends to enjoy the warmth of friendship and fascinating scenery of nature. When I am alone, I prefer to bury myself in the ocean of books and chatting with the great in history, which makes me full of energy. 我的梦想（以一个翻译家为例）When it comes to my ambition, I have dreamed of becoming a interpreter since my early age. I do enjoy the process of learning a language. English is more a skill than knowledge, which means the more time you spend on it, the more fluent you will be. So I keep practising my oral English by means of reading aloud and grabbing all chances of free talking. Also I find great pleasure in reading original English novels. Though it is always tough and difficult, it is a significant procedure in becoming a interpreter. I am fighting towards my goal, and will always stick to it. I firmly believe that I will be the one who do the simultaneous translation in the General Assembly of UN. That's all. Thank you for your time and attention!在演讲时切记要保持微笑，如果你不能很好的控制自己的紧张，最好把目光确定在台下三个点之间，以一定的频率在三个点之间转换。在准备的时候注意要有临场的感觉，当你照着镜子看自己的动作时你就会发现自己的身体也许会晃来晃去，也许你的重心会在两只脚之间换来换去，这些都是不好的仪表。一个出众的speaker应该注意自己的衣着包括神态，挺胸抬头，目光坚定，加上适当的肢体语言。这些都是为自己的自信和表现力加分的东西！祝你好运！

Honorable judges ,my dear schoolfellows, good afternoon. Thank you for listening. My topic is .... 我个人觉得前面太罗嗦，所以省掉了根据你的演讲内容，选择一些看起来过渡自然的句子，避免生硬。最后结尾再thank you也可以