You may be disappointed with your looks or your figure. But, don't let the lies of the enemy take any root in your thought life.
Whatever he says, he says because he comes to lie, steal, kill and destroy. Any and all self-destructive thoughts are not from God. You can be assured of that. Read John 10:10 to be sure:
"The thief does not come except to steal, and to kill, and to destroy. I have come that they may have life, and that they may have it more abundantly."
Jesus didn't come to condemn the world, but to save it. He did the same thing for you and I. So, what if the enemy is lying to you right now - how should we respond to it? Here's your answer:
"What then shall we say to these things? If God is for us, who can be against us? He who did not spare His own Son, but delivered Him up for us all, how shall He not with Him also freely give us all things? Who shall bring a charge against God’s elect? It is God who justifies. Who is he who condemns? It is Christ who died, and furthermore is also risen, who is even at the right hand of God, who also makes intercession for us. Who shall separate us from the love of Christ? Shall tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword? As it is written:
'For Your sake we are killed all day long;
We are accounted as sheep for the slaughter.'
Yet in all these things we are more than conquerors through Him who loved us. For I am persuaded that neither death nor life, nor angels nor principalities nor powers, nor things present nor things to come, nor height nor depth, nor any other created thing, shall be able to separate us from the love of God which is in Christ Jesus our Lord." - Romans 8:31-39
Always look for the answers in scripture. Every answer to every problem, concern or lie you're being told or telling yourself can be found in the Word of God.
God gave you your body and it is a holy temple of the Holy Spirit (1 Corinthians 6:19) and meant to honor Him. Don't believe anything less for yourself. Workout. Discipline yourself. Give yourself grace when you mess up and keep on going. Don't ever EVER give up! Never ever, EVER quit!!