I guess it depends on perspective. I'm 5'7 and I ain't growin no more so yeah I'd say you're tall. You may have had your growth spurt early and stop at 6'4 or so. Or you might end up freakishly tall like Yao Ming, that'd suck unless you were good at B-ball and can go pro. You'd have to buy all custom clothes and shoes (expensive), can't fit in cars, have to get a custom shower and bed. I think 6'4 is a good height, tall but not weird and difficult.

150 is a bit light but you're 14 so it's normal. I'm about 155-160 but I'm older so my metabolism has slowed. I'll bet you eat whatever you want and have a hard time gaining weight, you'll naturally get heavier and fill out as you get older. Just stick to basketball and not judo LOL.