What is the version of the following sentence with correct punctuation?

Have you always wanted to be a fashion designer but you cant go to college because you are still in your teens How to Become a Fashion Designer when You Are a Teen How about the idea of designing clothes for yourself
Have you always wanted to be a fashion designer but you can't go to college because you are still in your teens? How to Become a Fashion Designer when You Are a Teen? How about the idea of designing clothes for yourself?