Goods transport operator registered in gst due to msme loan requirement

so the situation is like this. we registered for loan with the help of udyam in sbi and for that we registered for gst no. before march. we are goods transport operator (we are not GTA) and we are exempted from gst filing as i watch through youtube but i dont know if its right. so what do we file in gst. they constanly message for filing. GTA take the tax directly from the money he gives to us.