Acceptance has a lot to do with self-discipline. Any aspect that we don't like about ourselves can be changed, if we are willing to take the effort and turn things around. When denying your state of discipline, you are very likely to have a totally wrong perspective on reality. This can be either due to overly pessimism, or due to overly optimism, regarding one's true capacities.
How exactly is one fully accepted in Christ? First of all, he/she is a child of God: "Yet to all who received Him, to those who believed in His Name, he gave the right to become children of God." ― John 1:12
Then, he is Jesus' friend: "I no longer call you servants, because a servant does not know his master's business. Instead, I have called you friends, for everything that I learned from my Father I have made known to you." ― John 15:15
He is acceptable to God: "Therefore, since we have been justified through faith, we have peace with God through our Lord Jesus Christ." ― Romans 5:1