I just built a PC, shouldn't it run better than it is?

I just built a PC, and I tested Minecraft straight away and only got as high as 150 fps. I was expecting way more out of my PC, because my old Asus laptop could achieve up to 250 fps, even though it only had a Nvidia geforce GT 750 and other not so good specs.

Here are the specs of my new pc:

CPU: AMD-FX6300 3.5GHz
RAM: 8GB
Graphics card: Msi radeon r9 270x 2GB
Operating system: Windows home premium 64 bit

I'm a little disappointed that a pc with way better specs than my old computer is slower.

I know I'm being a bit greedy with fps, but I expect way more from the specs I have.

All feature is okay, just you need to boost your fps.