Help me repair my life story! Please! I am beggin you!?

Here is my severely saddening and unaltered life story. From age 1 to age 6, I was thin. I was so thin, I could see my ribcage. Then, I gained weight. Now this wasn't your ordinary weight. My metabolism went down the drain, causing me to become slightly obese by the age of 10. Now, my obesity isn't too bad, but it is bad. Because of my obesity, my girlfriend broke up with me. This only goes to show she only wanted me for my body. This was 2 years ago at the age of 12. Now, I am 14 and I weigh a whopping 245 pounds, and I am 6 feet tall exactly. I am made fun of because of my obesity, and any female I come encountered with is appalled. How can I fix this. How do I lose my wretched body fat? Please! I am begging you to tell me! My life is a wreck! I need help! Now, I know this isn't fully my fault, due to genetics and crap, but what can I do to change it? Please help me!