Worried that if I start acting differently people will think I’m being fake.

Recently I managed to get on an upwards trend in terms of my confidence and mood in general. I’ve been ‘faking it till I make it’ a bit and it is kinda working, I’m way less anxious and feel better in social situations. I want to try and come out of my shell more and get out of my comfort zone and try to do new things. I’ve been thinking of going to more social gatherings music festivals etc. and starting to use social media, since basically everyone else my age uses it and the main reason I never did was that I felt self conscious. The main problem that I’m facing is that a part of me is still scared that people will see me acting differently and think I’m being fake or acting weird especially people who knew me when I was less confident and more quiet. This worry has been one of the factors that has stopped me from changing the way I act in the past. Am I just being paranoid or is there any validity in my concern, if so what should I do about it.