Mac.... Commenting on, liking pictures on fb, and making eye contact and smiling?? Those are not indicative of anything except a friendly and polite person! Goodness. By those standards I must be leading on a whole lot of people.... Coworkers, students' parents, friends, family.....

Ask her if she is interested in more than a friendship. Then you'll know. If she says no then sure that will be awkward for you but at least you can end another unhealthy fixation before it really starts.

I'm going to ask - have you done ANY of the things I've suggested to help you? Have you tried to join in to any social activities involving people your own age? Any? Even one activity that is actually demonstrative of people wanting to interact with others socially. Especially one that is repeatable. In all of your posts... You talk about hobbies you do solo which are nice but do nothing for your need to socialization.