How could I get rid of my outie bellybutton? (photo)

The appearance of your bellybutton can be changed to full innie via umbilicoplasty (belly button surgery) which can be done under local anaesthetic keeping the scars on the inside. 
There are several reasons for the umbilicus to stick out (excess or lax skin, excess tissue, hernia...) and each of these causes has to be assessed and deal with separately. If you decide to have surgery, make sure you choose a surgeon with experience in this type of surgery. 

Dear Cheerful7144,
it is hard to tell for sure, but if there is no umbilical hernia, you can get good results with umbilicoplasty. If you are considering a surgery, I would suggest you to consult a board-certified plastic surgeon. Only after a thorough examination you will get more information and recommendations.
Daniel Barrett, MD

Thank you for your question.  When you have an examination, you will need to ensure a hernia isn't present.  If it is this needs to be dealt with as well.  This belly button can be made into an innie belly button by pulling it in under a local anaesthetic.  All The Best