I found out that it's a problem on my end (probably because of the Macbook). I don't know how to fix it though... I have tried disabling trackpad drivers, graphic drivers; same thing. If someone can tell me the cause of this problem I might be able to find a way but I don't know what's causing it...
On a side note, I tried running Osu on my Mac using Virtual Box. 'Tap to click' worked, but very low FPS and very buggy images. I then installed GuestAdditions (which includes VirtualBox graphics drivers) and FPS increases and less buggy . However tap to click seems almost unresponsive. It works, but randomly. Like 1 out of 10-30 trys it works.
I asked someone who doesn't have this problem. Not a Macbook but he has an Intel graphics card. Seemed like the same driver as I have so... I'm lost.