@TinTin1
I think its a great idea to try and play to your strengths. I mentioned before that i dont like speaking to people on phones either, but if you have been told you're good at it, then its probably more a confidence thing... which i think it has always been for me. A bit of practice in a reception/admin style job and you may find you like it a lot more.
Then, with your studies, you may find this leads to more opportunities with the experience you'll get in the sort of roles you mentioned. It sounds like you have a good plan and I wish you all the best in it.
Low confidence can definitely be a difficult thing to fight, but you seem to have found a good understanding of your strengths and your success in your business/admin studies seems to be a good indicator you're on the right track which will only allow you to develop your strength more as your confidence increases. You definitely demonstrate a lot of resilence and self awareness as well, which are fantastic traits to have. So be proud and positive about yourself, and I'm sure greater success wont be too far away.