My jawline slightly curves inwards right before my chin. What alternatives do i have to fix this? (photo)

Fatty deposits in the neck  can be located in the sub-mental  or sub-platysmal space. A platysma plasty is required after any fat is removed from the sub-platysmal space. This is known as a neck lift. No skin removal was required on patient's less than 50 years of age. A chin implant is placed across the front of the chin to give more projection and angularity to the chin itself. For many examples of the combination of chin implant a neck lift, please see the link below

Yes, you would benefit from cheek augmentation (implants or fillers); and Radiesse to the jawline.  Your post photo shows angularity to your face, which is a great look for men.  See the video below in which the man had Radiesse to the chin/cheek and jawline.  You can see the transformation.