[22/M] Does she feel the same way? [21/F]

So I'll be the first to admit I'm not very good at detecting signals unless they're super obvious. We've known each other for about a year (Met via online) and I'm planning to go visit her in the summer. Though over the past couple months I've grown feeling for her and we've also become a lot closer. We talk to each other daily through voice chat and even spent hours texting each other at night talking about anything really. Some possible signals I've had out there (Said I was cute, liked my laugh, has fun talking with me etc), but could it just be she's comfortable around me as a friend? I want to tell her how I feel, but I'm just worried if it's not mutual it could break apart a good friendship.