Someday, you're going to look back on all the progress you've made and be glad you didn't quit.
All the networking, resume revisions, interviews, feelings of rejection, growing pains, etc. will pay huge dividends in the end.
I get so inspired by the stories I've read on here from people who've gotten their 'big break.' I remember the days when I personally didn't even want to get out of bed in the morning because my life lacked purpose and I felt so guilty. Had I quit, I wouldn't be so confident and in love with my career today!