Hair dryness

So the ends of my hair feel really dry and they actually “fluff up” if that makes sense. My mom said it doesn’t look dry when I asked her to trim it tonight but it feel super super dry.. I’ve tried tons of different shampoos and conditioners, I’ve tried using a T-shirt for drying it instead of a towel, nice brushes, I don’t use heat but once or twice a month, it gets tangled really easy... I have straight hair that’s not thick but not thin.. Any tips?..