being too young

yesterday, travis picked me up from the gym and asked, "do you have an hour to spare?" since i love nothing more than procrastinating my homework, i agreed to go up to daybreak with him and take a peek at some homes for sale. we ended up spending three hours up there and found a house both of us are kind of obsessed with. and it's kind of terrifying! there are so many "what ifs" to worry about. like when our realtor called last night and both of us froze, not wanting to answer on the off chance that he's going to tell us the buyers backed out. or weren't pre-approved, or anything else awful. i finally answered.
"hey so the buyers want to come over tomorrow night at 7 to take some measurements and show their kids the house."
i agree to this and then hang up the phone.
"travis, what if they take the measurements and none of their stuff fits in our house and then they change their minds!? and what if they are bringing their kids over to see if they like it and then when they hate it they're going to back out!? what if we are stuck in the house for the rest of our lives!?"

obviously, i'm a little stressed. travis reassured me that they are excited. they just bought a house! they want to plan for it and show the kids their new home! they are feeling the excitement we were feeling while looking in daybreak. but i just want to call the buyers and ask them over and over to promise not to back out.
i'm just not old enough for all this. is that just how everyone feels for their entire lives?