Any ideas on why i'm always chewing on things or putting things in my mouth?

Oral fixation: You may have an oral fixation or nervous habit to have something in your mouth to keep your mind off of any problems you have.

Bad habit: We all have at least one bad habit and it is difficult get rid of it. The fact is that every single bad habit can be broken and replaced by good one (e.g. breathing exercise, muscle stretching). Regardless of the bad habit, always look for a permanent replacement. Cognitive behavior therapy could be a very helpful tool.