If that's the decision you've come to then, you should be happy with it. If you're only saying it b/c you're frustrated and "at a low" then, you'll eventually come to regret it. Sometimes (and I'm sure you know this already) what we want out of this life is going to be a struggle; more of a struggle for some than for others. But, i know from experience that we who have to struggle to achieve the goal are the ones who will definitely cherish and appreciate it more.
If you want this, then GO FOR IT! No matter how long it takes, in the end when you succeed you'll relish it. I read a book, Becoming a Doctor, by Melvin Konner not too long ago and I feel that would be great reading and a good motivator for anyone with thoughts such as those you have posted.
Read the book and tell me what you think. BTW, Good Luck in whatever you decide to do.
Corey.