I'm watching tutorials for compressors, hopefully it might solve my problem. Thanks for the help so far.

Keep in mind if you are out putting your tracks to a buss that becomes cumulative.  They add together and will be louder than the individual tracks soloed. 

John
Keep in mind if you are out putting your tracks to a buss that becomes cumulative.  They add together and will be louder than the individual tracks soloed. 

Just to expand on that to demonstrate the idea. If you had 2 identical tracks. Both were showing zero on the their faders, combined they are going to be twice as loud on the master fader. This would be +3db. Now pan one fully right and one fully left, and now the master fader be back at zero.
 

I don't have two identical tracks, just one guitar, bass and vst drums in this relevant project. Though I tried duplicating the guitar track and panning them right/left but it didn't help at all. The master peak still goes abaut 3 or 4 dB in red. BUT there is no unwanted distortion in the mixdown or playback.

Gainer
I don't have two identical tracks, just one guitar, bass and vst drums in this relevant project. Though I tried duplicating the guitar track and panning them right/left but it didn't help at all. The master peak still goes abaut 3 or 4 dB in red. BUT there is no unwanted distortion in the mixdown or playback.

It would probably benefit you a great deal to do a search for and study "Gain Staging".

pull all your track faders down until the master no longer goes over on peaks, then use a compressor/limiter on the master to bring up the master level
 
then google "how to mix a pop song from scratch" - it's been floating around for years and covers all the basics
 
good luck! have fun :-)

That sounds useful gonna try that, thanks

It's a very common beginner's mistake to set track levels too high because the overall mix doesn't sound loud enough to your ears. Of course, it's also possible to have track levels too low, but that's usually not the case.
 
Start by following pwalpwal's advice and turn down all tracks until the master meter is well below the red, preferably hitting around -12 dB or so. Then, if the mix doesn't sound loud enough to you, turn up your monitoring system. (If you're monitoring on, say, laptop speakers, it might not even be possible to get it loud enough, and that's why most of us use powered speakers for monitoring.)
 
The idea is to mix for balance, and not worry about how loud the mix is. Achieving the desired loudness is going to be a separate step, tackled after mixing is complete. During mixing, crank your speakers or headphones up until you get enough volume to do your thing.

bitflipper
The idea is to mix for balance, and not worry about how loud the mix is.

 ^^^^^this