My neck has lost an immense amount of elasticity at 20 years old? (Photos)

Hi! In the last few months I've noticed my jawline and neck turn to mush. My lower face has begun to sag as well. I am a recovering bulimic, but have been doing well for months. I do not smoke cigarettes or take in nicotine at all, but have been smoking Marijuana for anxiety for two years. I don't know what is to blame but am desperate for a solution as its getting worse by the day. When I lie down my face and neck almost rests in a puddle of skin. Please help! It's loose skin, not fat.

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