When people burn out, it's usually not a result of being underpaid or not having a good position.
It is much more likely they are not deriving any real satisfaction from either their work or their career.
But rather than look for an excuse or something/someone to blame, the best place to start figuring out how to make your work more satisfying is with yourself.
You need to look is inside rather than at what your job entails, the pressure it brings or how much you're being paid. Those things may eventually become part of your personal vision, but from the onset you need a clear understanding of what makes you tick.
Rather than working 50, 60 or 70 hours a week for no personal gain, you must evaluate your current position. In many, many circumstances you will find that small but focused changes to your current situation can make a world of difference. Most bosses will appreciate that you are dedicated and are taking the time to think about your career and how you can become a better, more efficient employee. You should be able to work out a better roadmap and schedule for your work and personal life.
Determine your interests. If you are disinterested in what you do, (or are supposed to be doing), you will not enjoy it and may spend too much time on certain tasks due to a lack of vested interest. If you find you are not doing the work you thought the job entailed, detail this to take to your boss. Try to relate your personal interests to various aspects of your job.
Determine your values. Your own values are important so make sure that what you do is something you can look back on with pride in later years and that others will say good things about your work.
Determine your abilities. We all have natural skills and abilities so you should try to do what comes easily and naturally rather than work against your abilities. Sometimes you need to take a step back to really analyze your talents and also establish what you are not so good at. Being honest with yourself will help in this endeavor.
Also make sure you consider your personality such as whether you prefer to work alone or be part of a team. Decide if you prefer to be given tasks to accomplish or if you prefer simply to be left alone to conclude a project.
Pay close attention to who you are and what you really want out of your career.
Once you have determined these, you will begin to form a blueprint and plan for your own success. You will have a clearer understanding of what you want to achieve, why you want to achieve it, when you want to achieve it and how you will achieve. And yes...you can always achieve it if you have the clearly defined vision and determination to make it happen.
"More powerful than the will to win is the courage to begin." - Unknown author