What's the best way to make my chin look less round, liposuction or chin injections? I really don't want a chin implant (Photo)

Thanks for posting your question and photo. From what I can see here you have an attractive profile. I don't believe you need a chin implant.  You do have a strong jawline and chin. These features are consider attractive. Look at Angelina Jolie or Megan Fox. They both have attractive faces with strong features including their defining jawline and chin. If you are referring to the "round" area as underneath the chin then something conservative like smart laser lipolysis or radio frequency therapy could help here. Please consult in person with an expert in these areas for definitive answers. 

You do not need a chin implant. It looks as though liposuction underneath the chin would yield some improvement. To buffer some of the sharpness of the chin fillers could be used.

I suggest avoiding any chin implant as you already have good projection.  If you do not like your chin shape, fillers or jaw surgery are your best options.  You should see a facial contouring specialist for treatment options.  Best, Dr. Emer.

From the one picture you posted, it does not appear that you would be a good candidate for a chin implant.  The projection of your chin appears good.  Either an exam or more pictures from different angles would be needed to give you further advice.