The word “No is so very powerful. It does not need a reason or an explanation.
When your goal is choose happiness the word No can be your best friend. Do you want to go, can you do me a favor, can I borrow, and whatever else people may question you for, if they are not in your best interest, just say no. They most likely will ask for an explanation if the form of ” Why not?” All you have yo do is say that you don’t want to do that. Most of us feel obligations towards those that we are close to and will assist however we can even if it is a detriment to our happiness. We would rather sacrifice in our own life then to have someone else judge us for not doing something.
Stop caring what others think about you. Be you, be the best version of you that you can be. True friends will accept you for who you are and others will slowly fall away. Let them. Fake people who are only around you for the things that you can do for them are not the type of people that you want to associate with. If you have to choose between doing something for them and choosing happiness, you are better off being happy.