is it possible to run it with petrol or diesel? [ i have only one so i am scared to try running it with petrol or diesel]

Your engine runs on methanol, probably a synthetic oil for lube, and nitromethane as a combustion enhancer. It allows the engine to idle very reliably, gives a top end performance boost from about 10% Nitromethane and above and makes starting easier. It effectively increases the compression ratio by giving more available oxygen to the mix, improving volumetric efficiency.

You cannot use Petrol in this engine, it is not designed to use this fuel, and simply won't run. Nor can you use diesel from a car in this type of engine. Those fuels are for completely different systems. Just use exactly the fuel specified for your engine and you will be fine.

As you are interested in this subject you should look further into it, perhaps you should look into becoming a mechanical engineer even. How engines basically work is fairly straightforward, but learning the details and alternative methods can keep you busy for many years!

I attach a couple of recent questions I have answered.

Good luck