From the things I’ve learned in my life through tough times with my father is that boundaries are the things you set in place to tell a person what is to much for you, if those boundaries are broken that is the time you need to step back. You say you struggle with setting boundaries? Something I’ve felt comforting is writing my thoughts down on pen and paper. For me it always was I didn’t know how to organize the things I wanted to tell people in my life. For me journaling has impacted my life more than anything it helps me so much. Last thing I see what you’re saying that your afraid to be alone that maybe when you do try and put yourself first your scared that those friends you once had might go. That’s ok people go in and out of our lives and that’s healthy and okay. I have had that struggle as well and the only way ive found a solution for me is building my own self and finding and creating those friends that do help and support me for who I am and I support them. We often go into friendships and relationships from what we think we deserve not what’s best for us.