First thing is to think of an idea an original idea. Then you need to make a storyboard. Then you need to think who is the protagonist what does he do and who for. You need to make sound for the game and graphics. Once this is all done you need a design document. Then you need to code make your sprites and other things. After you are done ask someone to try out your game then publish.
Video game designing has exploded in the last few years. If you want to make your own you should start small. Don't get excited you will fail on some things. First you need to choose your tools. Then you need to design your game and choose sounds. Then you need to get someone that is honest to play your game. Repeat this process and it will get better.
First you need some simple tools. After you found the right tools choose a concept. Then you need to make a simple level. Design the gameplay. Make a few levels after you get done with that. Test your game after you polish the graphics and sound. You just made a simple computer game.
Making a video game can be a lengthy process. It cannot be rushed though. First you need to design your game. Find a concept. Then make your budget. It will be hard if you are bad at art. But you can hire someone. Last but not least you need to code your game. It can be a lengthy process but worth it. Your game will most likely not be the best game but it's a start.