I need help

I struggle with anxiety, depression and ptsd. I find it hard to do anything and I have been in a relationship for the past year however I feel like I'm holding him back cause I don't like going anywhere and I just want to be in bed all the time but he wants me to meet his friends and go to parties. I'm not sure what to do in life and I just feel like crying all the time. Every little things makes me have a meltdown and I find it difficult to be happy most of the time. It's difficult to breath, my chest hurts bad and I can't concentrate on anything nor can I sleep. Nothing ever feels right anymore. Sorry for all that but I can't find anywhere to talk about it and I don't feel right going to sites like beyond blue of kidshelpline. I'm in my mid teens and I just feel like a burden so i rarely get out of bed or leave my house. I'm not sure what to do.