Using the adjective haphazard you mean "lacking order or purpose; not planned". I need to know if the bold sentence blow makes sense in a natural way within my self-made scenario:
After graduation in pure mathematics I decided to continue my education in French literature. Now, I have a master's degree in math and another master's degree in literature. But when I turn back and look at my past years, I think I have made a big mistake. As a successful businessman today, I think all my studies have been haphazard (meaning not measured and calculated and without planning) so far while it was much better if I studied in the field of business management for instance.
If not, then please let me know what would you use instead?