sneaking out to a party (17f)

hey so theres this party in 2 weeks and I want to go so bad cus im literally never allowed out . I’v hung out with mates to the movies / lunch prolly 5 times in my whole 17 years . Ik ppl say when im an adult I can go off n do wtv I want once I go off to uni but I also feel like I’m missing out on my teenage years ?? Like bar going work n volunteering I do plus school I only sit in my bedroom . I’ve been invited to sm parties before n have neva gone with excuses to my mates n I’ve explained how strict my parents are to them but it js rly sucks cos whenever ppl r chatting ab these functions I always js feel left out in a way cus I could never experience these typa things . Now, with this upcoming party , I feel like I could successfully sneak out cus my older brothers now gone off to uni n im swapping rooms to sleep downstairs instead , and theres a window right outside that goes onto the pavement from the downstairs bedroom so i dont needa worry ab locking doors or anything. Also with clothes I can literally pack a bag with pjs n js leave it hidden in the corner of our garage, so i can just change then go back into the house again. Also , my mum is a DEEP sleeper and has neva checked up on me at night bar the times when I had a fever ect . I’m also thinking to not hang out long ill get a taxi ( paid in cash) 2 streets down from my house around 10/10:30 once my mums asleep , n leave the party 12 straight away. I usually stay up till 2am usually most nights anway n i neva hear anyone awake , even when i make a cup of tea orsmth during the night nobody hears . Idk though cus in the back of my head i am terrified of the potential chance of her finding out but yeah. If u could give some advice that would be appreciated, thank you :)