Dream meaning: Airplane crash

Hello , it s been like 8 years and I Had this dream a lot , the dream is : I witness an airplane crash , I'm not in the plane but I see the tragedy . I've read that it means "your dreams are too big " and it s true that during 8yrs I couldn't achieve anything I wanted so I lowered my expectations and I still see this . What does that mean? This is worrying me