Reply to 13 inch Macbook Pro, feeling some doubts?

Hey guys, I've been a Mac user for about 6 months now and purchased a 13'' inch macbook pro mid-range without retina. It's the 2012 model, I was on a budget and made the decision based upon portability/functionality at the time (I'm a college student and wasn't aptly producing music like I am now). I have been working with Logic Pro and was noticing that a lot of people on various sites just trashing on the MacBook Pro 13'' inch in regards to music production. Will I eventually have to upgrade to a 15'' with better specs if I want to be successful at producing quality tracks? Or can I get away with my current model? (I have an external monitor that I use btw).

Thanks for any input or advice in advance.