Is it correct to use the word "decided". What i want to say is that due to cirumstances, I became an Engineer although it was not my career goal but since I am now a Engineerr, I decided to love my profession.

I am now a Engineer by profession and decided to love my profession.

 

I think we might usually use "learned" rather than "decided" -- but "decided" is not wrong (and they will mean slightly different things). And you can drop the first "profession":

I am now an engineer -- and I've learned to love my profession.
I am now an engineer -- and I've decided to love my profession.

In either case, you'll need more context, of course, to let people know what caused you to say this. And "engineer" is lowercased in English when it's used in the general sense you have used it here.