Hi there -- I don't know if this is the right place to ask this question, and I'm sorry if it is super obvious, but I just had to ask!

I booked a roundtrip economy flight from JFK to TLL through HEL. On the way there, I would REALLY like to just stay in Helsinki and not fly the segment to Tallinn, but from what I understand this would cancel my return trip. Is this true? Is there any way around it?

Thank you for any insight!!