Substitute teaching will certainly open your eyes to some of the harsher realities of teaching so don't consider THOSE experiences to be typical of what you will experience in your own classroom. Some might say that if you can survive as a substitute teacher, you can do anything!
Teaching is a calling and a profession. It is not a job. You do it because you are called to do it and it serves a purpose in your life. Teaching will take time, energy, and commitment. You will run up against boneheads and bozos your whole career. You will also meet some wonderful and exceptional people and will impact the lives of many, many students.
Just because you are out of college don't think you are through learning. When you go into teaching you commit yourself to lifelong learning. You will take classes and then you will take more classes. You will go to workshops and baby, YOU WILL READ. You will read a LOT. If you don't, you won't grow as a human being or a teacher. If you don't believe me, look around the staff room one day after you have been in teaching awhile. You will be able to pick out the ones there for the check and the ones there from the heart. You will also pick out the ones who read and learn, and the ones who can't be bothered.
Good luck to you. You are off on quite an adventure. But please don't judge teaching by your sub experiences. Not the same thing...... at all.