Hey that girl of the video probably felt attracted to girls since always but also to boys, but eventually her tendencies towards females grew bigger.
You on the other hand are not attracted at all to women, you just worry about the idea of being attracted to females, and you are clearly describing the symptoms of anyone suffering from OCD, " Like my stomach and heart are going to explode. An hour ago I felt ok and now I'm a mess. I've always considered girls as friends not lovers. I can't. " Also everytime one of those thoughts comes to your mind you try to disprove them, that gives attention to the ocd and makes it worst, repeat to yourself this mantra "This is just my OCD talking not me, this are just thoughts and thoughts have no power over me" or practice deep breathing techniques, don't engage the thought cause that will make it worst.
That girl you talked about has seen women not as friends but as lovers.