Disappointment

One of my biggest fears is disappointing others. I hate the feeling that you have let someone down and not lived up to their expectations. I've always wanted people to be happy with me. I've never wanted conflict so when it happens I'm not sure how to handle it. I usually end up shutting down and let it destroy my confidence.
I only bring this up because it happened today (it's happened more than once a d there have been more extreme examples but this is what made me think of my weakness). It was during my art class. The teacher announced that we needed to turn it our take home projects and it completely slipped my mind that we had to do one. So when she said it I was like "crap...". But then I realized that only one person in our small class of 7 people only 1 person did it so I didn't think she would me as mad at just me. Maybe she would bead at the class in general. But no... That's not how it happened. Unfortunately I was the last person she asked and that's when she snapped and started getting upset. Then she asked why I didn't do it and all I could say was that I just forgot. So she said things like "I'm just disappointed" and "you always turn in your projects on time". Instead of me saying something back I just kinda took it all on me like a burden. It weighed heavily on me all day and probably won't be lifted until I turn in the project. I wish I didn't take things so personally. I wish I didn't empathize as much as I do. I wish I didn't care what other people think of me as much as I do...