Minecraft Java 64-Bit bug?

I tried logging in as my minecraft account (happychappy90) and then it launched, but the game didn't come up and the launcher crashed and said this:
Error occurred during initialization of VM
Could not reserve enough space for object heap
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Can anyone help? It's so stressful not playing MC D: