What should i do?

So, me and my friends have a party coming up for halloween, ik its early but we just planned it early bc it is fun. There are gonna be drinks there, which i was really excited about, but i had to tell my parents so my friends parents didnt get in trouble when they unexpectedly picked up drunk 15 year olds. My mum, however was not happy about this, I think the main reason was my brother, he started doing this stuff at my age and he still has a problem to this day, he is getting better but he is struggling slightly. I completely understand her concern but, i am not like him, we are not alike personality wise at all. I am just very curious to what being drunk feels like and i really want to drink at the party, I have had alcahol before and gotten a little drunk but not so much i could really feel it. Thankfully she hasnt gone as far as to say i cant go but still. My dad is more relaxed about it, he assumed there would be alcahol there anyway. Because he has a more accurate image of what teenage parties are like. I wont get drunk at this party i will just get a little tipsy because then i can just eat after and i will be fine. What is everyones advice because in the future, such as new years i do want to get properly drunk.