"Enjoy your life without comparing it to others."
As writers it's easy to get so caught up in the end goal we forget why we're really writing and once we've hit a plateau it gets hard. We start looking around us to see who else be there in the thin air. If we find others subconsciously (or consciously if your a glutton for punishment) we compare ourselves with others and their work. This is very dangerous to do.
We have different paths and we have our own ways. Just because So-and-so does it this way and can draft a full novel in 3 months, (great for them!) doesn't mean it'll work for you and your writing style. Then you have Keyboard Fingers who marathon types and writes no less than 2,000 words per day. Stop!
If it works for them like I said, great for them. But don't beat yourself up for not achieve their goals. That's why you are so disappointed in yourself and your work. If try accomplishing someone else goal, you're just going to get tired.
Look at the hard work you've already done. You just started? Fantastic! Simply starting a MS can be the hardest thing for a writer. You're stuck on a scene? Take a breather and come back with a hatchet. (Figuratively speaking of course.) How many people do you know, besides your writing friends, who even attempt a feat such as you're own? Be honest. They're aren't too many. Why? Because what you are doing is hard. It something non-writers won't understand. It takes time, something we all wish for more of. It takes dedication, another thing to come by nowadays.
So my dear writers, don't compare yourself to others. But instead compare yourself with yourself when you first began. Anything is an accomplishment from where you started.