I'm not sure if I'm in the right forum, but I have been wrestling with this for many years. 
Sonar is a wonderful tool, and so much more powerful than when I started with Cakewalk Audio many years ago. 
 
My problem is that I am afraid of recording.  It seems every time I hit that red button, I am left with disappointing results.  In the past, I have blamed it on my tools - that I am missing some plug or instrument, or that my mics or pres aren't "good enough". 
 
Well, I have run out of excuses, I can't blame it on tools anymore. 
 
I'm not sure if anyone else has faced this problem, but I'd be interested to hear how you got past it.

Thats what loop record and take management are for :)
Start recording and keep trying until you feel comfortable and play your best. Then go back and discard all the bad takes.
Or better get someone else to press the record button for you. I find that helpful!

Welcome.

I am assuming that you are concerned about the recording process per se, and not the material that is being recorded. In the latter case, Noel has good advice. If the former, your situation could be due to two issues:
1. Your recording is sub par.
2. Your expectations are excessively high.
 
1. Could be related to the studio environment, the equipment quality or the technique of using the equipment (mic choice and placement, level setting etc.). If the problem is technical competence, then recognize that recording engineers, who often are in separate bodies than mixing engineers, have typically spent thousands of hours learning to use the best equipment to capture the sound at the best quality it will deliver. If you are a professional recording engineer, then it might be fair to compare yourself to the best in your field. If not...
 
2. Could be related to the fact that you are comparing your recording to stuff you hear on the radio. That stuff is not really recording in the sense that it much resembles the dry tracks that capture the original performance. It has typically gone through hours of processing by experienced specialized mixing engineers followed as often as not by another pass through a mastering engineer's hands (ears?). In the event that you are getting great dry recordings, but less than polished professional final products, then unless you are a professional or have the same levels of experience, setting this as a goal may be a bridge too far.
 
There is a rough rule of thumb that it requires about 10,000 hours of practice to achieve mastery of most skills. A professional working forty hours a week, fifty weeks a year will get to that level in five years. I for one do not expect to live long enough to master these skills at the level of my involvement in what is just a hobby. In any case, it is missing the mark to experience fear at the initial stage of the process of making a record. Wait until you have completed the process, done your best at every stage, and then revel in the disappointment, shake your head at the waste of your limited life essence and start over. Or just quit and find something you enjoy more. 
 

Relax and don't worry about anything. Hit "record" and act like you didn't.
 
Some guys used to admit to only singing in the shower. There's also something to be said about public restrooms with tiled walls. Other things that might work:
 
Solitary confinement
 
Well padded isolation booth
 
Alone in the car

soens
Relax and don't worry about anything. Hit "record" and act like you didn't.
 
Some guys used to admit to only singing in the shower. There's also something to be said about public restrooms with tiled walls. Other things that might work:
 
Solitary confinement
 
Well padded isolation booth
 
Alone in the car

That makes me think of one of the feature in Logic. You dont have to press the rec button in logic. Just keep playing. Once you feel like you have played something great just recall it by hitting a keyboard shortcut. Hope I am not wrong abt this. Its really great feature coz you are not gonna be conscious that you are recording something. Its like recording what you were singing in the shower. Only you never knew its getting recorded. You can play them back later lol

 Sometimes being "self aware" isn't a benefit.

A glass of red wine before you hit the red button - Best not on every take though!

What tenfoot said, however, we may have different tastes in alcohol lol. Also like what Noel said, try to find someone else to hit the record button for u, this allows u to JUST focus on your performance. They dont have to be engineers... just someone your comfortable to press one a single button to record you. If your having good recordings and just cant seem to get the mix right... im sure there's plenty people here that would love to help out if you post the song for a listen and give some advice. From my experience most people here on these forums just want to promote the art of music and willing to help in almost any way.

All the other person needs to know is where the R key is!