Go into the attic to determine if it is a load bearing wall. If it is load bearing, do not remove unless you are trained in putting in a header and removing walls.
Ask a professional
It is important to make sure it isn’t a load bearing wall, like the above comments mentions. To be on the safe side, you can have a contractor check it out to see what type of wall it is.
Hire a professional contractor to ensure whether or not it is load bearing. Check Home Advisor to find one.
Google and call a licensed contractor.