Hi,
Sorry to hear you're experiencing this issue.
Some users are having this problem with the new launcher, downloading and installing the "Legacy Launcher" should fix this problem. You can download the "Legacy Launcher" at this link.
https://www.minecraft.net/en-us/download
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.