Most of the time, there are things that we don't see that our friends see... most of the times, we thought that we completely knew ourselves, but no...
These past 8 months, you've become better, you learned to love your your self and learned to dress your self the way you love it... In where this achievements you say looks good... I said "looks" good because that is what it seems to look like, but we don't really know about how other people are affected by changes of one person... It is maybe other people were offended, other people were not understanding or some didn't like your Change...
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About the people around you aren't showing any support into bettering your self... maybe there is nothing wrong with your old self... I mean like, why change if there wasn't anything wrong about your old self... another possibility about why they don't show any support is maybe, they actually do but it's either you can't see them or it is either, it isn't so visible or supporting you silently...
About if it is your fault why your best friend grew distant to you now is still unknown... but well about if you are crazy, no you are not crazy... but instead, it is like you actually lack confidence on your old self, since you said your role is the supporting role... Even though no one even asked you to be their supporting role, or even if they were people who asked you, are they your directors of your life, no there not, every role you take depends on what you think your self is, if you looked at your self as a supporting role, then you are insulting your self, you are the one who doesn't support yourself... well, about your best friend, better talk with her, but don't ask directly, just ask things and know the answer... if she avoids you, there might be something wrong, that is when you ask her straight to the point...
Being strong maybe was one of the reason, maybe your strength actually grew to big it crushes other people... or maybe about loving yourself already became an over confident attitude which is also one of the possible reason why other people aren't supporting you, or actually doesn't like you being that way..
Well, I hope I was a little help here... Well, good luck...