It's great if you want to tell your crush how you feel but it really isn't necessary if you aren't trying to pursue anything. Sometimes it's just a crush and there are no intentions beyond that and there isn't anything wrong with that. Don't feel pressured into telling your crush how you feel if you really don't want to. You don't have to explain shit to anyone and you don't have to search your soul to figure out why you are crushing on that person. Not every crush is a life-altering, cosmic event. Sometimes a crush is just a crush. No further meaning. Enjoy.