Well you did use the word "extreme" so I will answer yes, you probably are exaggerating your fears as many of us have. In my experience, fears become even more pronounced and toxic as they are bottled up and left to fester in the dark.
If you actually do transition you may find your face is no longer the biggest concern and many of us have found a smile and some confidence is even more important. Women come in all shapes and sizes and you may feel different with a focus on just being the best you possible. There will always be someone younger, cuter and more glam but who matters most, you or the peanut gallery?