I have a problem with my hair, it seems to always be tangly. Not super tangly, just not like other girls' hair where they can just run their fingers through it with no problem at all. When I brush it, my hair gets all staticy and five minutes later I have to brush it again because it gets all tangly again.

I have medium length straight hair and I've had this problem for as long as I can remember. Can anyone recommend anything for me to help me untangle my hair and make it stay that way?

You most likely have fine hair because mine is fine and I have the same problem.
Do you use conditioner? Also you could try something like Johnson and Johnson No More Tears.

I guess I have fine hair, but a lot of it. My hair is very thick. I use regis brand hydrating shampoo and conditioner and it was working for me, but as with every shampoo I have ever used it stops working after a couple of months but this lasted the longest.

I have noticed that when you stick with any one brand after a while it builds up in your hair.

You need to alternate between 2 or 3 shampoos/conditioners and use clarifying shampoo when it feels like 'it isn't working'. I never use the same shampoo more than 3 shampoos in a row. Also it is good to have a good PH balanced shampoo. Baby shampoo is suppose to be one of the PH balanced shampoos.