Welcome Izzy!......this place is a good start to finding your way and answers to questions........we just about all have things in common as far as religion and your topic esp.
you: I am scared to learn another religion just because I was brought up that if you did that, thats the ultimate sin that is unforgivable.
me: I would start with this point......Why are you scared and what of??.........you are not officially a JW....so you have more freedom than if baptized...and.....it is not "wrong" to learn about other religions.....even WT has a book called "mankinds search for god" and that is what it tries to do, so you have every right to check out other religions, but i agree that spirituality is personal, and most religions just try to help you become more so........and why do you feel a desire to "learn another religion"......you can learn without joining btw
good luck on your quest.....for me......i decided no religion matters anymore as i know for a fact NOBODY can truly answer the big questions......Why are we here, where are we going.....the dead aint talking......nor is anyone in any spirit realm if there is one............oompa