Can you just think away ptsd with no therapy

My parents are convinced that its possible for me to just think my way out of ptsd and just "ignore it". I don't know if this is true. I had something horrific happen to me a year ago and I've been living with the physical and mental consequences since then, it's awful and I have a hard time functioning, I'm a completely different person. My parents used to have sympathy but now they're just tired of me. They are convinced that I'm not trying hard enough, in my dad's words "you're making yourself depressed and you're addicted to misery". What I went through destroyed me and my body was affected badly as well as my mind. I don't know what to do or how I can work my way out of this. Can someone give me advice