Some people pray in tongues privately but when someone speaks in a congregation setting there must be an interpretation according to the NT.
Dearly beloved 'kaylagirl', please according to the Holy Scripture, the 'interpretation' is according to the 'unknown tongues spoken in the Church', and only 'two or three at a time' at a time, and the others take 'turn', so that 'all believers' who 'hear' them in 'interpretation' in common understanding 'language', understand what have been the 'intercession' with GOD, in order 'altogether' to say 'Amen' (1 Corinthians chapter 14, in 'context), 'period'.
GOD bless you all in the name of LORD JESUS CHRIST.