Q: if i do ALOT of pushups will i get pecs

A: A lot of pushups will mainly just give you good muscle endurance -- ability to do a lot of pushups or other light chest exercises. They will also build up your pectorial muscles in size somewhat, but by themselves pushups will not do a whole lot to either give you much pectorial size or definition. If you're already very lean and just looking for a bit better defined pecs, then pushups will be enough. But if you need to lose some fat off the chest ('man boobs'), then you need a complete diet and weight training program to achieve optimal results.