The first thing that you need to consider when you are thinking about becoming a video game designer is how much you really understand games. Liking a game and understanding it are two very different things and the more time that you spend constructively and critically thinking about games, the better off you are going to be. Take a moment to consider how you are going to be able to get started in this field and also think about the cases that you need to take.
Remember that when you are thinking about becoming a video game designer that you need to understand what you are going to work on. For instance, you might be someone who is interested in software, which is essentially what makes the game run, or if you have an artistic bent, you might be more interested in how you can bring your game to life through images. Both are essential for the creation of a video game. To get the training in these fields that you need, you will find that there are a number of different options open to you that will allow you to study them. Bachelor's degrees in programming and computer art can go a long way towards helping you get the background and the context that you need to move forward in these areas.
Once you have the training that you need, you should think about how you are going to get your foot in the door to the video gaming industry. In many cases, taking on an internship or an apprenticeship, even if it is not paid, is something that is quite important for you. Take some time and make sure that you consider how well you are integrating yourself into the industry. Also remember that you might choose to become a freelance designer who will be brought on to work on certain aspects of the game. Similarly, you may also find that working as a video play tester can be something that will allow you to make the connections that you need.
Keep in mind the fact that you are going to need to worry about your soft skills as well. Being a great programmer or a great computer artist might not go far if you don't have the communication skills to back it up. Take a moment to think how you might work in an office like this.
There are many ways to become a great video game designer, so take a moment to consider how you can get a position in this amazingly fast-growing field.