Most careers that involve designing mechanical systems require an engineering degree. Engineers use software, such as SolidWorks, AutoCAD, etc. as a tool in the design and manufacture of their product. If you are interested in designing, I would encourage you to continue your education and look into a good engineering school. You should probably look at the curriculum, see what classes are involved, and consider aptitude testing (if you haven't already). I've been a practicing engineer for 26 years and it can be a rewarding, interesting career.