Should I invest my student loan living costs if I don't need them?

I am a 19-year university student going into my second year and have just finished applying for my first student loan. I had originally planned on using my living costs and chose to receive $150 a week, but I no longer need this money. I am considering investing it, but I'm not sure if this is a good idea or where to start. Any help or advice would be greatly appreciated.