What should i do with my ford ed falcon? (australian)?

hey everyone, i have a 1993 ford ed falcon sedan, it is a ex-military car that was bought at a auction. My dad has had it ever since, it has been treated well, it hasn't had a great amount of services and i have been the one to change the oil and filters for a year now, i grew up with the car as it has the same age as me, i am currently on my learners and will soon get my p's. i have spent a lot of money on this car, for paint, door, rear spoiler, gas struts, seat covers ect. and a thing that keeps bugging me is if i should keep it, or get something else? it is a very smooth car to drive and has good power, but it is the engine that keeps eating at me, i keep thinking about the condition of it and wonder if i do something sudden it will destroy the engine. i dont know the condition of the pistons and am constantly worried.. any advice will be greatly appreciated!