Basic Mortgage question

[J_V]

I bought a condo about a year ago. I am paying about 6%. It is a principal and interest loan. The way I understand my pay schedule is that I pay mostly interest in the beginning years (w/ a little principal) and mostly principal in the last years of my mortgage.

If I payed off 150k worth of my mortgage next month, would my next payments pay off a higher % of principle or would I just have 50k deducted off my lumps sum and stay on the same (%interest/principle ratio). I hope that was clear enough.

Essentially I want to expedite the process of getting into a situation where most of my 2300 is going toward principal and not interest. Is this possible?