Person: CooCooK4Choo, i see you're doing more than one form of development. What do you want to do as a developer?

Me: I want to do everything i can possibly do.

Person: You have to pick a stream to go into, you can't do Web Applications, 3D Development, Unity Game Development, Swift and Java.

Why can't i do everything? As a junior developer i feel that doing everything keeps you prepared for those unwanted situations. Besides Its not like i'll be doing Web Base Applications all my life. if i do, i'll probably kill myself before 30(currently 21).