Neutral:
* Observed: This is a broad term that simply means being watched.
* Viewed: Similar to observed, but implies a more passive watching.
* Noticed: Suggests that someone has become aware of your presence, but doesn't imply any intentionality on their part.
More specific:
* Surveilled: This implies a more formal or systematic observation, potentially with a hidden intent.
* Monitored: Similar to surveilled, but often refers to being watched for a specific purpose, like security.
* Stalked: This is a more sinister term, implying an obsessive and unwanted observation.
Figurative:
* Under scrutiny: This suggests being closely examined or investigated.
* In the spotlight: This implies being the center of attention, though not necessarily intentionally.
Ultimately, the best word depends on the specific situation and the feeling you want to convey.