Okay guys.. I am so lost! I want to be a developer but can't decide on a certain area. Like should I be a web developer or mobile app? If I am a web developer, should I concentrate on front end or back end.. If mobile app developer.. Should I focus on Android or iOS or cross platform?

I really can't decide what to do and what to learn? Feels like to learn everything and at the end not learning actually anything.

Any suggestions guys? I will be really grateful!