Everyithing turns white and it shuts down/Crashes.

Im going straight to the point, when I try to open a world I get to be in it for 1 minute (aprox.) and then the whole screen turns white, and it closes within 2 seconds, and it has been like this for 2 months. Also, if you want more detail of how things were going for the whole 2 months, it was like this; at the beggining I coldn't even open it, again, the screen is white, it shuts down and it was like this for 1 month. Later (2nd month), its kinda got better, I could be in the main page for long as I wanted but when I opened a world it closed inmedatly. And the final result would be the 2nd problem I said.

Also, one more thing, does v1.14.1 not exist? then what do I have?? I put v1.15.1 because it wouldn't let me create this or "post". (please tell me if I have to change something from the information)

Maybe the question is, "what were you doing when it broke?"or "what did you try to do for this to happen?", 1st question; I was only playing normally and one day I couldn't open it anymore. 2nd question; I did nothing in minecraft more than playing.

I would like to know what is happening and if it would be able to fix it (it should be able) or if I can do something to stop it, or maybe it's my computer (which I don't think so), please help. 🙂