Same.
The same thing happened to me! I try to go on 1.12.2, and the "Mojang" screen doesn't even fill the monitor. I click on it, and it says it's not responding. When I try 1.14.1, the "Mojang" screen fills the monitor, the bar fills except for this small amount. I click and it's not responding. Please, someone, fix this! I really love Minecraft and don't want it to go down the drain like this for me! I usually play a lot, and I'm an extreme fan since 2012. I don't usually complain about little bugs, but I just can't play. I'm a little disappointed it isn't solved yet with all the same complaints. I'll be honest as the rest, my computer isn't the best, it's a Windows 10 on a ThinkCentre Computer. It usually doesn't give me problems like this easily. I really would like to play again! Please let me! <3 you Minecraft.
It could be the mods, but I never succeeded on activating it.