Dare to guess what I am?

Question

I have many colors

I'm a transformation of another thing

I can be different things, if shaped properly

I can hurt you

I used to be strong, but now I'm thin and fragile

I usually don't come alone

I'm here for a really long time

I can be of use alone or with other things

There is no age limit to use me

I come with a price, but I was born free.

What am I?

EDIT 1: Here is another line to help you figure out the answer, if you need:

If I die correctly, I can become me again

Answer 1

You could be

Paper

I have many colors

Paper though often white can have many other colours

I'm a transformation of another thing

Commonly made from wood pulp

I can be different things, if shaped properly

Can be e.g. notepaper or rolls of wrapping pepper

I can hurt you

Paper cut

I used to be strong, but now I'm thin and fragile

Used to be a tree and now a sheet of paper

I usually don't come alone

Often in pages of a book

I'm here for a really long time

Paper last for centuries

I can be of use alone or with other things

Paper aeroplanes or with pens for writing paper

There is no age limit to use me

From babies using tissue to centenarians writing

I come with a price, but I was born free.

Paper costs but comes from trees

EDIT 1:

If I die correctly, I can become me again

Paper if recycled can become itself again

Answer 2

Are you

ICE

Explanation follows

I have many colors

Colored Ices (Ice sticks) and Ice Creams.

I'm a transformation of another thing

Transformation of water

I can be different things, if shaped properly

Ice cubes, Blocks, Ice creams, Ice Sticks, Sip-up etc

I can hurt you

Can cause toothache and freezes if hold in hand for long.

I used to be strong, but now I'm thin and fragile

Ice blocks are strong, but Ice sticks are fragile

I usually don't come alone

With a stick. or may be some time with drinks.

I'm here for a really long time

Reference to natural ice or may be the ice age.

I can be of use alone or with other things

Icesticks can be used alone. Ice can be used alone if injured. Ice can be used with drinks or other consumable items.

There is no age limit to use me

Definitely no age limit

I come with a price, but I was born free.

If bought from store, we have to pay. But ice is made by freezing (when the temperature goes down) which is free.

If I die correctly, I can become me again

If ice melt to water, it can be frozen back to ice again.

What am I?

Ice / Ice stick

Answer 3

Are you

Glass

I have many colors

Glass can be of many colors.

I'm a transformation of another thing

Transformation of sand.

I can be different things, if shaped properly

IVases of different shapes, windows, cups etc.

I can hurt you

Glass can cut you and cause serious injuries..

I used to be strong, but now I'm thin and fragile

Glass is made of sand. Sand is strong, you can't really damage it.

I usually don't come alone

In a phone, a tablet, a TV, windows...

I'm here for a really long time

Glass is one of the Earth's oldest human-made materials.

I can be of use alone or with other things

Glass can be used in windows(alone), or phones, computers etc.(with other things)

There is no age limit to use me

People of all ages use glass somehow, glass is everywhere. TVs, tablets, phones, computers, cups, windows.

I come with a price, but I was born free.

You can buy glass, either alone or in something like a phone. But glass is made of sand, which you can get for free.

If I die correctly, I can become me again

Glass can be crushed back into sand.