Your Graduation happens only once, it is a result of years of studies. Your parents may be upset because that is something they look forward in your life, specially if they are the ones who helped you in your studies.its a way aldo of appreciating them. You could have cheered them up by attending to it for few hours and later on be backed to your investments. Since things happened already, to deal also with your guilt feelings, ask for apology to your parents. I believe it is also the way to fix your relationship with them and later on you might be able to explain bitcoin and cryptocurrency to them and win them to support you. Remember too that Bitcoin investment is good but at the end of things that might happen in your life, lets say you lose your investments, its your family that will be there for you. I hope I was able to help.