Using Public Transportations

The plural form of public transportation is the same as the singular form. Also, public transportation is often shortened to "public transport," so you can use that phrase as well. :)

Even though, my family has two cars, I usually use the public transportations, such as buses and subways.

You might think, I am trying to save the earth.

In factActually, my company is so close fromto my house, so that it saves more time to use buses instead of my car.

When I try to park there, I haveget a headache to findsearching for an empty parking lot.

As a result, I don't prefer to use my car.

Your sentence is good, but this is more natural: As a result, I prefer not to use my car.

Even though, my family has two cars, I usually use the public transportations such as buses and subways.

You might think, (that) I am trying to save the earth.

In fact, my company is so close from my house, so that it saves more time to use buses instead of my car.

when you use "so" to explain how much, you usually pair it with "that". ex) she is so happy that she took us all out for ice cream.

On more thing,: there are not enough parking lots where I usually visit.

As a result, I don't prefer to use my car.

alternative endings: so, therefore, thats why

Using Public Transportations

Even though, my family has two cars, I usually use the public transportations such as buses and subways.

You mightay think, that I am trying to save the earth.

IWhen in fact, my company is so close fromto my house, so it that I saves more time to useaking buses instead of driving my car.

On moreAnother thing, there areis not enough parking lots wherein the places that I usually visit.

When I try to park there, I havein those places, I get a headache to findlooking for an empty sparking lot.

As a result, I don'tsuch, I prefer not to use my car.