Missing the first leg of a roundtrip ticket on Ryanair?

I bought what i assume is a roundtrip ticket (although perhaps ryanair just sells each sector individually?)
I now cannot make the first leg (outbound flight) and will be arriving at the destination via another country on another day
I still need to take the return flight.
i cannot cancel the first sector or change it to after my return.
does ryanair cancel the remainder of a ticket if you miss a sector like most airlines or is it different?