Help with home loan calculations

New home owner here. Want to know if this is correct. (numbers are approximated for easy calculation).

Lets say I have 550,000 semi flexi loan at 3.5% over 35 years. Repayment is around 2500 a month. I calculated the interest is about 20k a year. ​

AFAIK the initial years of repayment are mostly into interest, and I can do extra payment into principal.

So if I am able to pay 10,000 a month consistently (instead of 2.5k), ​does it mean by 5th year or so I will be done with the loan (120k/year)? Will the bank charge me interest they have calculated over 35 years?

Is this advisable?

Tq in advance

*tried calling the bank but the officers passing the phone around.