My teeth are really tiny and i have lots of gaps. will braces pull on my teeth a bit to bring out my teeth more to make them appear larger?

No: The size of your teeth are...Well... The size of your teeth. An orthodontist can move your teeth into position where a cosmetic dentist/prosthodontist can make your teeth appear larger via veneers or full coverage restorations. The gaps can be lessened via orthodontic treatment, but if the teeth are "that small" a comprehensive evaluation with a good cosmetic dentist would be beneficial.

More needed: Braces may assist changing the positions of teeth, but not their size. Your perception that your teeth are small may be true; however, an assessment with an orthodontic specialist will help you to determine the best course of care for your situation.