This one is going to be short and sweet.
Never. Ever. Ever. Perm. Your. Hair.
You my dear have been blessed with beautiful brown hair. It's gorgeous! It's not a wishy-washy colour, it's nice dark brown hair and you have the most perfect blue eyes to go with it. The thing about your hair is that it's straight. Embrace the straightness! Say hello to smooth pony-tails and braids! Any length will work, you can have a bob cut, a pixie, or hair down past your shoulders - it will all look great.
If you are feeling bored with your hair (and we all do sometimes) then do any of the following:
1) Add a few hi-lights
2) Get bangs or grow them out if you already have them
3) Add some waves with a curling iron
4) Buy some new hair accessories
5) Get a great new cut
Don't get a perm. No matter how much you love curls, they aren't meant for your hair, otherwise you would have been born with curls. Curls for one night - great! Waiting six months for a bad perm to grow out - nightmare.
P.S. - putting lemon juice in brown hair and then lying in the sun for five hours is also a really bad idea.