muslim girls/guys advise me pls

keeping it short, its a simple thing yet im so scared to do it, then again I WANT to do it. Because if not now, then when? I'm a teen and I've came on holiday with my brother and dad. My ma couldn't make it here. Thats another story, but just one question. Is it bad if I just wanna go down to the lounge and sit there for a bit alone? Is it safe to do so? Not like ill die or whatever else my family's been blabbering on about if I ever go out alone. Its not exactly 'outside' but my rooms on the 7th floor and my dad n brothers room is right next door. Its unlikely that they'll come in, the past few days they've trusted me and prob haven't even imagined me wanting to go down alone. I didnt mention it to them that I wanted to go down alone bc then they'll keep an eye on me. Is it genuinely okay for me to go down at like 9-10pm and just either sit on my phone or enjoy the lounge? Its quite a pretty lounge too. But I'm also terrified because I've literally never been able to go anywhere alone. I mean never. My parents don't let me go out with my friends, they don't let me go out alone, walk to school, go to the corner shop, or anything. Then you've got girls my age hanging out normally with their friends and its just like, I wish I was capable of doing so. I wanna go down to the lounge tommorrow but I just pray I have enough confidence to do so, and that I do NOT get caught. Like if my dad decides to come into my hotel room tommorrow while I'm downstairs, IM DONE FOR. And if that happens what do I do? Shall I just tell them after dinner tmrrw to not disturb me because I wanna get some good rest? So please help me out.