i wanna get lik big pecks, but ive only been doin push-ups and i only have the outer part worked and the middle of my chest is lik flat how can i build up the middle and make my pecks bigger

do cable crossovers and close grips
make sure u also do decline ones....

when u bench use a close grip itll help your triceps and your innerchest
a wide grip will help your triceps and outerchest more like pushups do so i guess try dimond pushups or something

benchpress incline benchpress dumbbell bench press incline dumbbell bench press dumbbell flys cable crossovers all kinds of pushups
dips, sort of (secondary)

lift weights...

1.Diamond Push-Ups/close grip Benchpress
2.Elevated Push-Ups/incline Bench press
3.Dumbbell Flys

^^#1 is mainly to put emphasis on your triceps

I say you just sit at home eating 24/7. You'll have the biggest chest then

Just bench and do flys, decline/reg/incline and cable

Bench press of course... or the alternative way is eat more proteins and do a couple of pushups every day.

I say bench press flat position bout 3-4 sets 6-8 reps wit heavy weights after that immediatly switch to dumbbell flyes and do a set then have bout 1min rest to start next set.

Easiest way....Steroids.

do machine presses and dumbell presses lying flat. chest fly's work real good too

Narrow gripped bench press works well for that. Also, cable cross-over (make sure you don't round your shoulders forward), dumbbell flyes (all angles), and dips.

what my friend told me...

thx ima try that and the bench presses

Supplements are a waste of money, as soon as u stop, all the benefit fades away.
Since you're only doing pushups, your muscle imbalance is probably a result of the pushup position you use. cable crossovers or dumbell flys would be the best way to work ur inner chest, but flys etc shouldnt become a MAJOR part of your chest workout.
I personally find barbell presses most effective using varying bench angles (flat, incline and decline). try n do 3 sets at each angle, starting with wide grip, then normal and narrow grip for the final set. Flys and crossovers can be left as finishing exercise.
Pushups are still good though, it really depends if u want bulk or wanna look ripped. Alternate between weights and pushup routines for a bit of a mix.