You don't have to lose your confidence at all. Your smile can be absolutely regained. The best way to get treated will probably be by braces. However, your dentist will have to take x-rays and evaluate before deciding on the treatment protocol. One of your lower teeth might have to be removed and your missing tooth on the upper jaw has to be replaced.

It is definitely possible to give you a better smile that will improve your confidence. Orthodontic treatment is the best option available. You seem to have a missing upper tooth. After analysing your X-rays a decision can be taken whether to retain that space and give you a new tooth using implants etc or to move your adjacent tooth in that gap and shape it like the missing tooth. X-rays and clinical examination required.