Here's some information before we start;

I bought this bike for myself around Christmas, didn't know I'd be getting into road cycling at all.

So I bought a Mountain Bike for around 300$ (nothing too crazy) to ride and enjoy outdoors. I soon got hooked to long distances as I'm getting into road cycling. I exchanged my crappy stock tires with more slicker, road-type ones, and my bike can go 25mph easy for a MTB. Is it ok that I did this? It doesn't feel right but I love the distance, riding, etc.

What's your input?