New job opportunity some things I might do differently

Okay so I started off my phlebotomy career at a great rate of 18.50 working at a blood bank and I was bringing in about 1900 checks every two weeks this was decent money for 19 year old me. Fast forward in the job I realized how shady and sneaky these people were a lot of drama a lot of coworkers having sex with each other. Managers having favorites. Anyways me being too friendly and open to friends I fell right into their trap of the drama they had previous to me being there. One day this one coworker who was a known bully cursed my coworker out so bad to the point she started crying. Me trying to be Mrs captain save a ho I decided to stick up for her…and guess what happened yep I lost my job I was honestly devastated because then the friend ended up backstabbing me. I always see people saying how the phlebotomy field is very toxic but I think where o fucked up at in the first place was even talking to people at work! Anyways I’ve been offered a position at quest diagnostics and I just plan to do things differently I’ve also heard bad things about them but I really do want to try to turn a new leaf and keep a positive mindset about work so I will really try to stay to myself this time…it was honestly just a lesson learned that you can’t really save everybody you have to save your own ass sometimes. I’ve always been someone to speak up for a person (social anxiety fears me) but as I’m taking my way through adulting I realize maybe it is best to just shut the fuck up sometimes so lesson learned!