Whenever something good happens in my life, something always comes to ruin it?

I am 17 years old. My parents have always kept me at the house with the exception of school. Because of that, I can never make any friends outside of the classroom. One of my hopes my junior year was a trip to Europe with the rest of my class, which my parents had said we were able to pay, but as soon as the time came for everyone to sign up, my dad lost his job. He had applied to work at another hospital, but he got the job after the deadline had passed, so I ended up not going.I can understand that, and I do not blame them for what happened. My graduation party is coming up, but it ended up that all of my mom's friends are going to be there and none of mine. While I was getting the groceries that she had picked up to make all the food today, the marinades that she had bought broke the bag it was in and broke on the floor. She was furious, and now the party is cancelled. I had offered to go back to the store, but when I got there, the store was closed for today, so her decision remains. I have always held onto the belief that I am destined to be miserable and alone my entire life. It just made it easier to explain everything that happens around me. I got into the college that I wanted to, but because of that incident today, she wants me to go to a cheaper university, even though it's past the deadline to turn in enrollment deposits. I feel lost and as if my entire world is collapsing around me. Please, give me advice to get through this.