Anxiety

I’ve struggled REALLY badly with anxiety for about 4 years now. I’m 13 and I feel like I can’t do anything about what’s happening. Some days it takes me hours just to get out of bed, and even then I don’t feel like doing anything. I don’t really know what’s causing my anxiety so I don’t know how to help myself. It ends up making me late for school and meeting up with friends and all the stuff that I used to be able to do.

Please, does anyone have any advice?