I have nowhere else ..

I have nowhere or anyone to vent to so I’m going to vent here. Lately I haven’t been going to school because I’ve been feeling very insecure and my social anxiety is bad. I didn’t go this whole week and my friends are always telling me to go to school ( they don’t know how I’ve been feeling). I don’t know how to bring it up to them the real reason why I haven’t been going but whenever I bring up topics about my depression or anxiety they tell me that I’m okay and I’m just exaggerating, but whenever they talk about themselves I’m always the there for them and so it’s hard for me to even tell them how I feel. My friends have left all the group chats that I’m in and now I’m so alone. Please help