It's all relative...
Your case is pretty slight, but you look like you have gynecomastia. Working out might help you tone up overall, but if you've been self-conscious about it for this long, you might want to get surgery.
I think posting photos online can be deceptive. Lighting, camera angle, focus, exposure can all mask an ugly counter.
Has anyone ever pointed it out to you before? Stared at your chest? Cracked a joke? That can serve as something of a litmus test...