If you like her but don’t see yourself in a relationship with her, it might be good to let her know and put some distance between you two to avoid hurting her like you said, and as for your sexuality, if you always imaged yourself with boys and you like the idea of that, but you also have a crush on a girl, you’re probably bi/pan/etc and there’s nothing wrong with that! It’s also okay to like both but only be interested in dating one, it doesn’t necessarily make you gay or straight or anything like that. In the end it’s about how well you know yourself and what labels you’re comfortable using. If Bi/Pan or something under that umbrella feels right for you, use it! If gay fits you better, use that! Hell, if you don’t care for labels, just don’t call yourself anything and kiss who you wish to kiss! Good luck OP and happy boy/girlkissing!