The question is not whether or not you will fall, but what you will do after you fall. We all make mistakes - some serious, some not so serious. But we ALL make them. We all fall. However, falling doesn't mean we're through. It just means we have to get back up and go on. We can't be defeated if we don't quit.
Personally, I don't intend to quit. I know I've made more mistakes than anyone has a right to expect forgiveness for. But I do expect and have received forgiveness. Jesus paid the price for my sins, and when I confess my sins He is faithful and just to forgive them and to cleanse me of all unrighteousness. Glory to God!