For some issues I created/reported, I don't like to receive e-mails everytime something changes.
*I tried to unname myself as a reporter, but that's not possible (A reporter is required)
The default notifications are for reporter, assignee and all watchers.
However, to answer the original question, you need to do two things:
1. Watching is very useful, and I recommend keeping most of the "watcher" notifications (usually the ones about transitions, comments and reassignment, but lose the "issue updated" one as that's the noisy one). However, Jira adds you as a watcher on every issue you interact with by default (so blanking out yourself as reporter would not have helped you at all). To stop that, go to your profile and turn off "autowatch"
2. To clear out the old issues, run a search for "watcher = you". Then use bulk-edit. There's an action in there to remove yourself as a watcher.
To build on Christian's comment, the default notification scheme I believe has the reporter updated on everything. In my experience they don't want that. Often they only want 'milestone events' based on issue type. For bugs it could be when it is closed. If you use JIRA for CRs it would probably be for Approved and Implemented. Suggest the JIRA admin poll the users to see what they want. If everyone else wants everything, but I doubt they will, you'll have to live with it.
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