Voluntary contributions to fill gaps but I have no gaps

Hi, I came to the UK for the first time (form abroad) in 2015 to work. I have been working ever since. Recently I find out that one can pay "voluntary contributions to fill gaps" for NI. However, when I enter my NI records, I find the following: You have: "8 years of full contributions 26 years to contribute before 5 April 2049 You do not have any gaps in your record. " Is there any way I can make the voluntary contributions for years preceding my arrival to the UK? Thanks

Hi Ruth Garcia,
A person is only able to pay voluntary contributions from their Date of Entry into the UK National Insurance scheme.  
As you’ve advised that you came into the UK in 2015 then you may pay National Insurance contributions only from that tax year.
Thank you.