I’m really sorry it seems like your friends don’t understand how important your birthday is to you. Do you think you could explain you really want them to come to whatever and do what herb fun birthday thing with you?
If that’s not something you want to do or think would work, I would do is focus on people who you know love and care for you and see if they’d be interested in celebrating with you. Tell your parents, see if anyone’s eyes light up when you mention what fun thing you are doing – make fun plans for you, even if no one is coming. I know it seems lonely and lame, that’s what social media would have you believe, but one of life’s skills is to figure out how to be happy and have fun alone. Use this as an opportunity to plan the best day you can, and don’t worry about them. Think about yourself. Are you going to uni soon?