Usually, I'd accidentally overlook some posts but not these
Sky blue: A shade of blue that resembles the sky. Your heart is pure deep within although just like the sky, you're filled with mixed emotions due to the different circumstances.
Silver: A color that's actually just a shade of gray. Under the bright, metallic shine, this shade is simply a shade of gray. Under that mask, you're someone who's totally the opposite.
4: Ugh one of the hardest numbers >< I'll try something different... The fourth number of numerology... You don't seek attention, don't seek recognition, don't seek popularity. You don't really enjoy staying deep within the shadows, but you certainly don't require the spotlight either.
Conclusion: You wore a mask just to be mixed within the squad, filling yourself with multiple emotions as you question almost everything. Your heart is as clear as the water deep inside although it has always been ignored or replaced by everything you think and everything you're concerned about. You don't really need to be within the popular society, the popular group, as you just want a good life.
P.S This might be inaccurate because this is the conclusion I've made for your favorite number and color and every one is unique <3