I hope the following gives some ideas for your speech. Take those parts or points that interest you.
Hello friends, today I wish to tell you about my future ambition in my life and the strategy I will adopt to fulfil it.
I want to be a computer engineer, when I grow up. I want to be an engineer on designing the advanced computers of the latest technology, its components and peripherals. The reason is that I am interested in the most advanced technologies, fascinated by the electronics and micro level and nano level technologies. I want to achieve some thing great.
In order to become a good engineer, I will develop the skills and knowledge required. I will study my pre-university very well. I am interested very much in mathematics, physics and electrical sciences. I want to be a graduate from the best engineering institutes in India, that is, Indian institutes of Technology. Graduation from an IIT gives me sufficient knowledge and skills to reach my target in life.
I will join a good coaching institute that will prepare me for the Joint Entrance Examinations. I will study with absolute concentration and learn to solve problems logically. Already I am quite familiar with the components, and the structure of computers and the softwares associated.
After joining an IIT, I will focus on the current technologies of fabrication of computers, chips and peripherals. I will take the electronics club as my hobby. I know that we don't have a good technology in India to fabricate electronic chips and computers. When I have sufficient knowledge and experience, I will start an electronics manufacturing company in India. I want India to be like the advanced countries in the East like Korea, Japan, China which manufacture a lot of electronics and export.
I will go abroad and do a post graduate degree in computer (electronics) engineering. To be able to do this I will appear for the necessary examinations and maintain a good score during my graduation. I know it is expensive to study abroad, but I will secure a loan from a bank and repay it when I am employed later in future.