My S/0 and I are learning Korean together she has two years of experience compared to me who just started. I do not know what this says and I would like to know really bad! I really would appreciate save me!
Yes, "오빠(Oppa)" means elder brother, but many women use it when they call older male which is close to them or their boyfriend.
For example, if you are 21 years old and one of your senior students in your university who is male, older than you (23 year old) and close to you. You can call him "ㅇㅇ(his name)오빠" or "오빠".
Some Koreans it was a bit naughty to call older person than them by only his name.
So, James(male) is older than you and you(female) are close to James, you can call him "James 오빠" or "오빠", though James is not your brother.
James(male) is older than you and you are male. You can call him "형"
Jane(female), you are female, "언니"
Jane(female), you're male, "누나"
Some married couple in Korea, the wife calls her husband "오빠", because it was her habit since they were not married.
Some Korean people might think it awkward, but some of them it's not awkward.