The right side of my body never developed like the left side im like this from birth im missing my right peck on my chest why is thiscan this be fixed?

Poland syndrome: This is a well-known birth defect. The absence of the left pec pretty much defines it; there are often some other problems. Read up on the syndrome; famous boxer jerome thomas has it. If somebody looks at your chest when you're shirtless, tell them you were born without but you're still tough as nails & it'll get you extra respect. Most women won't care or will like the novelty. Good luck.