Clutch Installed. Vibration problem. Help

I just installed a spec 1 clutch, TO bearing, TO bearing retainer, new flywheel, pilot bearing, and rear main seal. Started her up and she runs great in all gears no vibration. Except in first gear when im taking off it vibrates really badly and almost stalls.. i look like an idiot around town almost stalling it every at stop. haa...It was the stock clutch in there before

Is it just the new clutch slipping cuz its not broken in Or its really grabby?

Or am i an idiot and need to learn how to drive a clutch? ha

Or something else?

Thanks.