Hey, there's nothing to be embarrased about! Having crushes is totally normal... and fun! Own it
If you don't tell him, and decide just to appreciate the awesomeness that is cool (and if you're in a committed relationship, mandatory! We're all human, we all feel attracted to various people at various times - often because they posess a quality we'd like for ourselves... but I digress
). And if you do decide to tell him, that's cool, there is zero shame in being attracted to someone! If he's interested, that's great, and if he's not, that's ok too, it's not because there's anything wrong with what you do/say/wear/look like/smell/enjoy doing... It just needs to "click" for both people involved, and if it doesn't for him, that's normal too, just continue to own it - you're not doing anything wrong! Crushes will come and go and they're fun, can be an opportunity for self-reflection (the "liking in others what you want in yourself" thing), and whether you tell anyone about them or not, and whether they're reciprocated or not... They're still pretty groovy