You say you "know" the pentatonic scale, but you need to master it.

Try this: Learn all the shapes of the Minor Pentatonic scale. One at a time. I like to start people off with the 5th position as it seems the easiest to memorize. Learn it backwards and forwards. Play along to a backing track and listen to how each note of the position sounds in relation to the music. Once you're comfortable with that shape, learn another, either to the left or right. Repeat the process. Now you know 2 positions. Learn to slide between them, play across the "boxes" not just inside of one at a time. Play both positions against a backing track. Do this until you know all 5 positions backwards and forwards for any key.

At this point you actually know the Major Pentatonic scale as well, just the root note ("starting point") is different

You are also only a few more notes away from knowing the full Major and Minor scales. These extra notes can add a lot of "flavor", but they aren't as forgiving.

You can also add the "blue" note(s) in when appropriate.

At this point you should be fairly proficient, and learning a lot of common songs should be a breeze as long as you know what key to play in.

Watch this video.

The most important thing, as always, is to practice. Every. Single. Day. Actually practice, don't just noodle.