How to straighten my fringe bangs?

I decided to try getting a straight fringe cut again for bangs, the problem I have is when I go to straighten them they don’t look full or curved but they turn out limp and touch my eyelashes. When I got them cut yesterday they were curved and they stayed out of my eyes and they looked fuller. How do I do this at home?

How can I keep my fringe from going curly after I straighten it?

I’m having trouble keeping my fringe straight. .
It’ll be fine when I straighten it in the morning but I walk to school and by the time I arrive at school it has gone wavy and kind of oily and it separates
It’s so annoying!

How can I keep it from doing this??
im not going to straighten my hair at school
thats just lame