Webites won't load

okay, so the thing is the websites most of the time won't load, and the problem doesn't seem to be the internet. These websites only load for a min or two every 10-15 mins, and in those 1 or 2 minutes i managed to play a video on youtube, soon after the video started, the websites again stopped loading, but the video continued loading. I think that tells the problem isn't with the internet. Same happened when i was downloading these files from Torrentz. The websites would give me hard time, but torrent ran smoothly throughout.

I was gonna call my ISP, but thought to check with you guys first since it doesn't seem to be disconnection issue. But still i'll call my ISP, once i'm done with you guys.

What do you think the problem is? And i've switched browsers too, nothing happened.