Should I be feeling this uncomfortable to post whatever on Facebook?

I have cousins who all act old and are so proper over what they post. I know it's important to work I work and go to school too but that's all they talk about… And there always with large groups of people. They probably don't even know what a selfie is, memes, or anything… I feel so uncomfortable posting certain things like my iPhone lock screen for example which is this: in total fear that I'm going to be looked at as a baby… I don't want their lives but I feel pressured into being like them. They have no sense of music, movies… All they care about is gossip and loads of friends.

Is it safe to install 3rd party iPhone 6 batteries?

I'm an electrical engineer but Apple does not sell batteries directly to the consumer. Instead, they ship it to the authorized service centre. The service centre charges a lot for a new battery(around $200 or more). While going through Amazon, I was able to find iPhone 6 batteries for $30-50. My battery is ok for now but I was wondering if it is safe to put a 3rd party battery

https://www.amazon.com/...01B4TEJUM/

What Should I Do About USPS?

I order a iPhone on the 23rd and it shipped the same day it shouldn't take long because it's only 15 hours away I tracked it and it haven't moved in almost 7 days the estimated delivery date is Dec 30th -January 4th should I be worried normally when I buy stuff online the tracking info is always updated I called for a request so they can tell me exactly were its at and it's been 4 days and haven't gotten a call