tl;dr there are 3 ways to get into smash. Be honest (requires a certain type of parent), lie through your teeth (requires you have a way to get where your going without seeming suspicious), **** off and do it anyways (requires you have indpendence and don't give a **** about your parents). I feel like we all go through the same **** with this but here's my story anyways.
Back in '06 I tried the honest approach cause I was kid. They gave me weird looks and acted like it was a childish thing but went a long with it...so long as my friend's dad brought me(and that guy was super supportive of smash, he even played with me and my friend as samus) but my friend lived far and I only saw him when he visited his grandmother so I couldn't even get in some smash once a month so I quit.
2 years later I tried again cause brawl, took the honest approach and tried to drag my school friends into it cause that's a great way to convince your parents you'll be okay. They played brawl though I was going to get them into melee. My dad was fine with it, though still giving me the WTF look and he offered to bring me, but my friends got the cliche I'll be better than everyone and won't even care to play strangers so they dropped out last minute and I went alone, which felt awkward for me and my dad. He was bringing me to the middle of nowhere to play games with strangers, and the real problem is he didn't care about it at all so I came late, left early, didn't finish pools and I quit again.
A year later I met up with that same friend who got me into smash to play a bit and he told me about a smashfest the next day. I tried the **** all, I'm lieing approach and got my friend to bring me to a smashfest. Somewhat awkward cause I didn't know anybody and couldn't play well but still fun. That was my ticket in, unfortunately I haven't seen that friend since that smashfest because he lives far and his grandmother moved away so meeting up was impossible until someone got their license, he quit smash by then and I haven't talked to him since. I quit again.
Now I'm going to school downtown and taking the subway, which just so happens to go by the place where monthlies and weekly friendlies are held. I want to get serious about this ****, I should have been playing for like 7 years by now but I'm just starting out so I lied to my parents, started playing smash, got my license...unfortunately the car I can drive is the one my dad uses because his car costs too much for gas so going anywhere means him feeling like it's easier to bring me and keep the car for himself so anything other than monthlies is still hard, tried lieing about apex and saying I was going to NY with friends, they didn't care but didn't like the busing down in the winter idea. I could've fought harder for it but decided I might as well practice more before shelling out money to go 2 and out in bracket pools.