NO!!! Do not learn C++ as your first (or second) language. Wait until you have either completely learned C# or master something like JavaScript. I made the mistake of trying to learn C++ after I learned HTML. :(
Join the Paint Jam a month from now. In my first jam (only a month ago, Fail to Win), I worked with unity for only 3 days and I learned everything while I did the jam. Besides only using MS Paint will be a challange. It'll be fun.