$Me: I want to start creating my own android app.
$Me: Let's start by installing android studio
*Goes to download AS*
$AS: That'll be 4gb of your disk space
$Me: well nevermind then

Really? 4gb for a fcking IDE and some build tools?

Most are emulators... Filter most out... And I believe you can install more later if you need it (it has been a long long time since I developed for Android....)

I think you've completed the install. If not then...
Customize the installation. And download only the following.

android SDK tools

android SDK platform-tools

build-tools (latest version),

Latest android API.

From Extras: Android Support Repository, Android Support Library, Google Play Services, Google Repository, Android Auto API Simulators, Intel x86 Emulator Accelerator(HAXM installer) if you are on windows.

Everything else is just emulator crap.
Physical device always beat the emulator.

Also a friendly advice if you ARE going to use emulator. Don't use the one Android provides. Try using Genymotion.

Lol. Then you haven't worked with Xcode to appreciate AS

Pff, watch this:
Vivado from Xilinx has ~50GB i believe.

I dont even know what is in those 50 big g's, probably some hidden linux distro images too, who knows...

4GB can fit in the ram of a phone twice, it's not a lot.