Help! I want to be scottish!?

Ok so I'm an American who is no more than a quarter of anything. I'm 25% Irish, 25% German, and 25% Spanish, and the rest is even MORE of a mix. I have friends who are mostly Italian or mostly Irish or completely Hispanic, and they all feel a devotion to their ancestors' country. I don't feel that sort of thing. Many of my relatives came 150+ years ago, like my german heritage is from 1751. I always hear people saying "Oh, I'm so proud to be _____." But there's no "old country" for me to BE proud of. I am fascinated with the UK as a whole, but I especially love Scotland, I plan on studying there when i'm older. There are so many people who love scotland, and I love it too. Is there any way that I can claim Scottish ancestry? I'd feel a loyalty to something, at least. Also, no one ever says "I'm just American," they say "I'm English" or "I'm Italian" or "I'm Polish." I can't just say "oh, I'm American" when someone from here asks me. That may work abroad, but here people will laugh and say "haha, no what are you REALLY?" it stinks :( I just feel left out. So if you have any suggestions, please tell me. Thanks.