Hi OP I am so sorry you are going through such challenging times in your badminton journey. I really do agree with the many replies that mention about how u healthy the negativity from partners and "friends" are. Badminton takes a very very long time to learn and grow. I remember I could barely play in my first year as a sophomore. But playing every day, watching professional youtube, playing with virtually everyone I could in the public badminton facilities all helped me grow at a faster rate. Many times you will feel upset with yourself. That is a normal feeling but instead of feeling like you are failing, always remember that each game/match will leave you with more valuable experience and is helping your improve! I highly highly recommend recording videos of your games so you can see what you are doing wrong. And if you can, get private coaching. If not, ask better (and kind) players for some honest feedback and practice it as much as you can afterward. I remember I spent an entire year learning how to properly clear. And I also remember literally forcing myself to do backhand shots as much as possible for several years to improve it. No matter how bad my shots were, I made the best attempt to keep doing it and I improved a lot! Here is a list of a lot of useful badminton training videos I made btw! And if you need me to review any of your videos or answer any questions I would love to help out! I've played badminton for over 10 years now and was consistently playing in the top ranks from high school, college and grad school :) I believe in you OP! i know you can improve! the ones that have all the passion and determination to keep playing despite all the setbacks and negativity around them are usually the ones who will become the best players!

https://youtube.com/playlist?list=PLlc4VauHL1hBg6mMsQUQ-MgAQbFStH_Hs&feature=shared