You seem to lack confidence in yourself and feel threatened. Why do you feel so insecure? Is it because you failed in the past at something? Everyone 'fails' at something at some point in their life. You should not be so dependent on one person. I know it is difficult because if there is no one else it makes you increasingly dependent on the one person in your life. Look back and think of all your achievements. You are a survivor. Take a deep breath and tell yourself how capable you are. Try to find other people to meet, join something - it will be better for your health than being alone. I know it is easier said than done. Best Wishes.