Well I WAS going to say you were good, till I saw your comment on Youtube dissing on my Ibanez SR 500 series bass....
lol jk, its a cool bassline and you played it fine. Honestly though, Youtube is the LAST place I would look for "constructive criticism", but the last thing you need to be worrying about now is what everyone thinks of your playing....just focus on playing. At the age of 13, you have plenty of others things to worry about besides a bunch of internet prowling jerks on youtube think of your chops.
There are people far better than me, that goes without saying, but many people in bands signed to major labels or guys who have played for many years have commented saying I'm a "good bassist". I've played for about 5 years now and have never gleaned anything worthwhile from posting videos of my playing on the internet...unless it was original material. It really is a waste of time and you're going to give yourself ulcers, dude lol. Play often, play hard, and let your playing speak for your talent in person...don't bother trying to impress idiots who can't play and diss on players such as Marcus Miller, Geddy Lee, etc.
Oh, and no problems playing with a pick...but make sure you have fingerstyle down too. As bassists, our bread and butter is how versatile and improvisational we can be. That's just friendly advice though, because I've had many doors open up because I've exposed myself to both techniques and worked at being proficient in them.
