Hey!
No problem - thank you for the kind words!
I would avoid stating that you chose law as your parents wanted you to, even if that is how it actually started! The interviewers are more interested in why you are still interested in pursuing a career as a lawyer, rather than what influenced you at the beginning (unless it is the core reason!).
You don't necessarily need to overcomplicate it or force commercial law into every answer (although I would add a commercial law element if that is the type of firm you are applying to).
I would start by briefly explaining what attracted you to law (e.g. its analytical nature or problem-solving element), and then focus on what made you stay. This could be that you enjoyed dissecting complex issues and building structured arguments, you liked applying theory to real-world scenarios, or you became interested in how law shapes business decisions. It always helps to link the points that you make to examples from your past experiences - for example, a particular module at uni, work experience, an extra-curricular activity, etc.
Then, I would link those reasons to the actual role of a solicitor. This could be by showing that you are motivated by working with clients to solve legal and commercial problems they face, or that you enjoy intellectually demanding work with tangible impact. Make sure that your reasoning is genuine, and again, that you back it up where you can!
The key is to show growth - lots of people know that they want to pursue commercial law from a young age, but plenty of people don't (including myself!). Even if law wasn't originally your goal, you discovered that you genuinely enjoy it and have excelled in it. Showing this self-awareness and reflection will make a far more compelling story than a disingenuous "I always knew" one!
Best of luck!