Context:
I'm a second year physics & mathematics student, and I took a piano course last summer semester, and I loved it.
During the course, the instructor first introduced us the basic theory of music, and then directly gave us 31 different music and asked us to study them (of course, first she played each of them to us).
Before this course, the only experience with piano that I had was watching a couple tutorials, and trying to play some of those exercises.
Although the last a couple of them, particularly the 31th one, was relatively complex to us, they were really elegant, and I really want to play them. For example my favourite the last one
While taking this course, I was taking other courses and studying other things and I did not have much time to practice, but I still was able to play this music in 2 weeks (It was due in 5 weeks), and I really enjoyed.
Situation:
Right now, I can't take another piano course, and I still want to improve myself on piano, so I have talked with an experienced player in university, and she advised my to start with Beyer's piano books.
However, the problem is, in order to go and practice skills, I need to play child's song, or song that I really don't want to hear, which sucks the wish of playing piano out of me.
Question:
First of all, do you have any suggestion about what can I do about this ? I mean as long as I want to play and learn, the complexity is something that I can overcome (at least try) without killing my motivation, but I do not have a instructor to pick me those musics one by one, so what can I do in such situation ?
Note that, although the very reason I want to learn piano is for personal pleasure, I still want to learn the theory, and the concepts as a student who is trying to be a professional in this.