Movies

So I love movies of all genres, but I know it's hard to change old habits. Both my parents are die hard horror fans, and I used to be, too. I of course knew it all to be false, but I grew up watching movies like that. My mom's going to take me to see the new "IT" tomorrow, as she wants us to spend a day in the city, but I feel guilty going to watch it. But I also need to respect what she wants to do. Help?