Help I'm panicking and I have no idea what to do rn

I'm having a really bad panic attack rn like I'm supposed to hang out with my friends tomorrow but I can't because they have there friends going and it's making me like really nervous and I don't know how to calm down. Like I would usually calm down by hurting myself but I can't do that anymore bc it's not good for me so what else should I do? Right now I just want to cut myself so deep or even just end it all I hate having panic attacks over tiny things I just hate it!!