Thanks for sharing your story! It was a pleasure meeting you at SF3!
And - I don‘t think, that it is a failure that you don‘t know - what to study or what your next carrier step is. Actually ... while discovering the world, you will discover yourself.
And I think it is much better to try something, which interests you than not trying it at all. Because you will never know the outcome otherwise. Either you will love it or not, but either way you will at least know - afterwards. And even if it wasn‘t as fun as expected ... there are always new things to discover.
RE: My 2018: Achievements and Failures - Turning My Life Upside-down