The teeth that are next to my two front teeth are small. What should I get to make them better? (Photo)

These look like what are known as "peg lateral incisors".  You need to consult with a good dentist, and have Xrays and a diagnosis. By the way, it is common with a peg that the other one is missing, so get a diagnosis and treatment plan that is accurate to your situation. 

The small lateral incisors are known as "peg laterals". The best treatment would be the following:1) Comprehensive Orthodontics to ensure proper occlusion and interdigitation of teeth2) Refer to an esthetic dentist to place veneers on either all four upper incisors or on the two upper lateral incisors.

You have Peg Lateral Incisors and bonding or veneers can give you a rapid improvement in cosmetics at a low cost.That said, I would advise you look into a DNA Appliance due to your severely underdeveloped jaws.  This can grow you a full wide smile and improve your airway and health.Your current situation increases your risk for TMJ disorders, headaches, migraines, snoring and sleep apnea.  The DNA is only worn 12-14 hours / day and you could bond 7 & 10 during treatment.The DNA Appliances utilizes Epigenetic Orthodontics to orthopedically grow you bones and orthodontically correct your tooth position.Ira L Shapira DDS, D,ABDSM, D,AAPM, FICCMO