Can I eat normal while I workout, or do I HAVE to take some extra protein shit?

Cookie7
I am 5'9'', very slender 114 pounds. I am slim and I don't work out in order to loose weight. I want to start to work out to gain muscles, especially in the booty and legs region.
The thing is I really enjoy eating my regular food. I am a vegetarian, BTW! I eat everything exept meat. I eat 3 times a day, but small portions, not because I want to starve myself, but because that is enough for me. I alsoo enjoy eating sweets.

My question is: since I don't want to loose weight, just to gain muscles, can I continue to eat the way I have eaten so far AND workout really really well, or should I try to change my menu?
Updates
+1 y
OH MY GOD I ASKED THIS UNDER THE WRONG CATEGORY!!!
Can I eat normal while I workout, or do I HAVE to take some extra protein shit?
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