Valid reason for breaking one's oath

Q: I am a 15 year old boy.

1. Once I was playing an indoor game with my family and lost. In anger I sweared upon Allah that I will never play this game. Now can I play the game? Is there any expiation?

2. Similarly I once went to a relatives house where I had an argument. I then sweared upon Allah and Holy Quran that I will not go to that relatives house.

Please guide me regarding both the cases.