If you are serious about your career aspirations, then you need to buckle down and learn the essential foundations of visual art. There are no shortcuts to this, and it will take at least a few years of discipline, perseverance, and inexhaustible passion in order to become competent in the foundations.
Fumbling around on your own without guidance doesn’t work for a lot of people, and even for those who are capable of figuring out stuff on their own, having guidance will speed up their progress/growth significantly. That is why you must read the sticky threads at the Art Techniques & Theories forum (linked below in my signature), and then start following the learning/growing strategies I have often laid out for those who are looking to learn/grow as artists.
This thread in particular (http://forums.cgsociety.org/showthread.php?f=166&t=84440), contains precious information that can change the lives of aspiring artists–IF read them carefully and take the advice to heart, and incorporate them into your daily life.
Put together a learning/growing strategy based on the advice I gave in those threads, and start training. However passionate you are about your dreams and goals, should be reflected in how hard you train, and if your training does not match the intensity of your desire to become the artist you aspire to be, then you’re in danger of becoming someone who is all talk and has nothing to show for his aspirations. So start learning, absorbing knowledge like a sponge, and train hard. Draw and paint as much as you can, and don’t do it aimlessly. Target your weaknesses whenever you work on an image–don’t just doodle aimlessly of the stuff you already know, and stop doing photo collages.
Learn to draw and paint, and then the whole world of visual art will be yours, because everything you learn in drawing and painting will carry over to other visual art disciplines, but the reverse is not true. If you can achieve competency as a 2D artist who can draw and paint, then you can pickup any other visual discipline much faster and easier–be it photography, graphic design, 3D, etc. Nothing else teaches and trains the essential foundations of visual art like drawing and painting does (although photography is incredibly useful for learning composition).