I can give you some insight about that. The outcome depends tremendously on your personality and strength.
If you have low self-esteem, you might feel great at first because of how everyone looks at you, but if you are also shy, you'll feel vulnerable. Not only will men look at you, but other women might judge you.
As your breasts continue growing, you'll become self conscious about them sagging, or that your back seems wider, or the fact that they cover your waist, so you look fatter than you would with average-sized boobs.
When you are shopping for bras, you'll notice all the cute bras are only available for small sizes, so you are left with black, white, beige orthopedic looking bras with huge straps.
People, even if they are not sexually attracted to you, will have trouble staring at your face for long, because boobs are distracting. You notice they are staring, but you try to ignore it to avoid making the whole situation awkward, even though you are really uncomfortable.
At night, if you try to sleep on your belly, your back will hurt after some time because you can't lay straight, so you'll either sleep on your side or on your back.
But even though they are a nuisance, you'll still find yourself playing with them, looking at them in the mirror, etc. They are still pretty and make you feel sexy, you just wish the unwanted attention wasn't part of it.