Congratulations on getting into the PA program! It seems like you have a tough decision ahead of you. If you aren't 100% sold on the idea of being a PA, then you should probably give up your spot to someone on the waitlist. Being a PA is not supposed to be seen as a "stepping stone" into medical school. PAs are competent professionals who practice medicine with indirect or direct supervision, but more importantly work as part of a health care team to treat patients. If this sounds appealing to you, and you like the idea of a career in medicine with flexibility and lateral mobility, then you should become a PA. If you want to become a physician and practice medicine independently in a given specialty, you should take time and reapply to medical school. Time off school is not the worst thing, and students benefit from it more often than not.
Message me if you need anymore advice!