I have to clean it up!...
But most of a time I just pick the messy things and...
PUT IT IN MY CLOSET!!
...Maybe if my mom read this, she will be mad at me.... I have to run!!
Uh... Bye!

"When anyone replies to a matter before he hears the facts, it is foolish and humiliating."​—Proverbs 18:13
=
I have to clean it up!...
But most of the time I just pick the messy things and...
PUT THEM IN MY CLOSET!!
...Maybe if my mom reads this, she will be mad at me.... I have to run!!
Uh... Bye!

=  The noun “messy things” is plural. So, the pronoun must also be plural.
= The sentence is talking about a possible future situation, so English usually uses: if + present tense
= This is so cute! ^^