I’ll never forgoet the first time when I was atI sat in the front seat inof a car.

It is happened when I was a 13 years old.

My grandfather had had an old car, an on thed one day he called me in ato the garage.

At first I was so excited, toughbut shortly after got atI sat in front seat I was frustrated.

I was frighteninged to do somesthing wrong.

Tookaking a deep breath, I managed to start the engine and driven from the spot.

RThe road wasn't long, but I wouldill never forget this experience.

I will never forgotet is the first time when I was at the front seat in a car.

It is happened when I was a 13 years old.

My grandfather had had an old car an on thed one day he called me in ato the garage.

At first I was so excited, though shortly after got atetting into the front seat I was frustrated.

I was frightening to doed of doing somesthing wrong.

TI took a deep breath and I managed to start the engine and drioven from the spot.

RThe road wasn't long, but I would never forget this experience.

I never forgot the first time when I was atin the front seat inof a car.

It is happened when I was a 13 years old.

My grandfather had had an old car and on the one dayday it happened he called me in ato the garage.

At first I was so excited, though shortly after got atin the front seat I was frustrated.

I was frightening to do somesthing wrong.

TI took a deep breath Iand managed to start the engine and driven from the spot.

RThe road wasn't long, but I would never forget this experience.

TheMy first experience in the driver's seat

I'll never forgoet the first time when I was atin the frontdriver's seat inof a car.

The "front seat" usually means the passenger seat. I think you mean the "driver's seat."

(It is happened when) I was a 13 years old.

My grandfather hadused to hadve an old car, and on the oneat day, he called me in ato the garage.

At first I was so excited, toughbut shortly after got at frontI sat in the driver's seat, I wasgot frustrated.

I was overwhelmed by athe number of different levers and switches.

I was frightening to doterrified of doing somesthing wrong.

Tookaking a deep breath, I managed to start the engine and start drivening from the spot.

RThe road wasn't long, but I would never forget this experience.

I'll never forgoet the first time when I was atI sat in the front seat inof a car.

It is happened when I was a 13 years old.

My grandfather had had an old car an on thed one day he called me in ato the garage.

At first I was so excited, though shortly after got atI sat in the front seat I was frustrated.

I was overwhelmed by athe number of different levers and switches.

Your original sentence is technically correct -- but "the" sounds a bit more natural than "a" here.

I was afrighteningaid to do somesthing wrong.

A note on "frightening" -- you can describe things or events as "frightening," but when talking about your feelings, you would use "frightened." In this case, "afraid" is a little more natural-sounding, so I used that in my correction.

TI took a deep breath Iand managed to start the engine and driven from the spot.

RThe road wasn't long, but I would never forget this experience.

I never forgot the first time when I was at the front seat in a car.

It is happened when I was a 13 years old.

My grandfather had had an old car an on thed one day he called me in athe garage.

At first I was so excited, toughbut shortly after I got atin the front seat I was frustrated.

I was afrightening to doaid of doing somesthing wrong.

TI took a deep breath Iand managed to start the engine and driven from the spot.

RThe road wasn't long, but I would never forget this experience.