Hair growth

When I was younger I had very long hair but as I got older I would cut it myself and it ended up being pretty short and uneven. 5 years later it's less visible but my hair has literally grown an inch:( it will not grow. I used to straighten it everyday because it did not look nice because of the length. But now it's nice in a pony so I never straighten it?
It's been like that for about a year and it's not changed atall?
Any tip?