I think you are focusing on the bad things. In my opinion, you should be focusing on the fact that, firstly, you were accepted (I am still waiting for an answer after being rejected in the past 2 years); then, you were accepted at the place you have always dreamed about! Isn't that amazing?! You are going to make a dream come true, either if it is your terminal degree or not. I face life like a constant school so for me it will never exist such thing as a terminal degree. You could try to forget that that is your terminal degree. You never know. Plus, if you happen to not being happy about your degree or your dream school, change can happen in a blink of an eye. You just need to want it too. Think positive, always focus on the good side of things and everything will be just great!