I sometimes feel like I don't love anyone I know
Who are the people who you feel that you do not love?
My best friend and also other female acquaintances
I'm sorry you're not having any feelings for them, and it's okay. Love isn't needed for friendship, just appreciation. As long as you are happy that they are in your life, that's okay and you don't need to strive for more and be who you are not.
I don't know. I just don't feel anything anymore.
Well just do your best to be present around these people, and eventually your relationships will build. Sometimes it can be hard to feel when you are always stressed out or weighed down with unpleasant thoughts. Try to clear your head or talk to someone who can help you get out some of your stress.