I think it is very good that you posted this...vented...talked about it and got feedback. It is good to get things off your chest, review a situation, find empathy and take in some ideas. Please try not to say things like "I will never learn." I do believe that what we think about (and also what we say) tends to "expand." So...although it sounds a little superstitious, try not to even utter those words. It might be better to say..."I had an experience that didn't feel good and I think that next time I will do it a little differently."
Perhaps in the future you might only get super nice holiday gifts for folks that you regularly exchange with and/or who exchange nice gifts with you. Everyone else, more modest gifts (perhaps ones that have meaning) and not worry so much if you receive a thank you or not. Concentrate more on folks who you are closer to and hope that things turn around in the years to come. Oh, and I think Fiberwendy made an excellent point as well. Also: Congrats on the good grades!!!!
Hang in there. (Hugs).