Hey, /adv/. I don't even know how to ask this the right

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Hey, /adv/. I don't even know how to ask this the right way. I haven't seen this type of question on here or anywhere I can remember. I wanna know if and how I should talk to my sister. My paternal sister. I found her YouTube channel. I was looking at my biological dad's YT channel, because we've talked a few times here and there, barely at all really, and he told me about it. I found he had a video of him and her on it, and it kinda made me jealous. I know it shouldn't, but seeing them happy together, makes me wish we two could've had that, but yeah.

This isn't for me to whine or bitch, but I wanna know, if I should ever try to talk to her. I think she's about 13-14. I know at that age, I wouldn't just talk to strangers that much, even if they were relatives, because they were still strangers, but maybe that's just me. I know merely being related maybe isn't a good reason to talk to or reach out to someone, but I have a pretty small family, and I don't want her to think I ignored her. Maybe she never even thought about me, though. I don't know. Is this dumb for me to even be concerned about and should I just ignore her existence because my dad fucked up? She's an entirely different person so I can't really think that. Please, /adv/, if you've maybe been in a similar situation.