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If someone at a US consulate/embassy told you not to worry about the selective service because of your age, it’s probably fine.

Good luck sorting out your tax situation. My kids are dual US and Canada and haven’t had to pay any US taxes yet as there is a tax treaty between the two countries. It has been expensive for me to pay someone to file the US taxes though.

One other point, assuming you are male, you were supposed to register for the US Selective Service at the age of 18. There are potential serious consequences for not doing so.

You can contact them and explain your case. Or maybe you don’t need to now as you are past age 25. They are easy to contact and speak with.

Source - same situation with family member