Hi Megan,
I'm sorry that your award is not what you feel it should be. The mobility descriptor was deliberately made brutally difficult! The planning a journey descriptor relates only to people with cognitive, sensory or mental health difficulties - you will not score any points there if you do not have a considerable problem in these areas
Bearing in mind the above, you are entitled to ask for a Mandatory Reconsideration of the award if you believe you should have scored more points. Have a look at the PIP guide and see what you think.
Nothing on this board constitutes legal advice - always consult a professional about specific problems