I'm looking for a descriptive word for someone who only sees things the way they want to see them
Solution 1:
One such word is opinionated implying that someone is having a rather fixed opinion (on something).
"She just can't seem to take someone else's view into account. She's very opinionated."
M-W:
opinionated adjective
: firmly or unduly adhering to one's own opinion or to preconceived notions
… focus groups, which tend to be dominated by the loudest and most opinionated people … — James Surowiecki
Solution 2:
According to MW Dictionary:
narrow-minded: unwilling to grant other people social rights or to accept other viewpoints