Can't Play Minecraft,When i open The Launcher it is always offline *my internet is working* and when i start a singleplayer world it crashes always

Can't Play Minecraft,When i open The Launcher it is always offline my internet is working and when i start a singleplayer world it crashes always

What I expected to happen was...:
Start The Launcher, Click Play, Join SinglePlayer, And make My Map

What actually happened was...:
Opened the launcher, it was offline my internet is working, tried to start a singleplayer world it crashed I tried like 7 times it crashed

Steps to Reproduce:
1.Open Launcher
2. Click Play Offline
3. Start a SinglePlayer World
4. GameCrashes