I've been playing Minecraft for over 8 years now and I've only started experiencing launch issues recently.
Wether it be 1.14 or any other version, whenever I click play, the Mojang logo appears with the loading bar. However, the bar only moves a bit before it stops. It will then proceed to infinite load. I left it up for over 10 minutes and the bar refused to move. The whole screen became white and it said "Not Responding" before it crashed.
I uninstalled Minecraft and reinstalled it, but it didn't fix the issue. I went to the properties tab and checked the compatibility but none of that worked.
Say something silly, Laugh 'til it hurts, Take a risk, Sing out loud, Rock the boat, Shake things up, Flirt with disaster, Buy something frivolous, Color outside the lines, Cause a scene, Order dessert, Make waves, Get carried away, Have a great day!