Hello and Welcome!!!
100lbs is a lot in just 1 year, but if you believe you can do it, then AWESOME!! Are you going to do a specific diet? or are you going to eat fresh and workout more?
Let us know what your plan is
I would love to lose 100lbs by next Christmas

I wanted to lose 1lb a week this year and I started on the second week of January, which is 49 weeks until the week of Christmas. I wanted to lose 50lbs

I am currently 41.4 and playing catch up. I have 2 weddings next year and would love to be 100lbs down if not more by then. (started at 323lbs and heading to 168lbs).
Stick around and let us know how things are getting on, join in some of the challenges, they are great for accountability.