CRF450R too much for me?

I looked at a used CRF450R and felt right at home on the bike it was awesome but i dont know if i could handle the power of a 450 im 5'5 150lbs 14 years old nd i have alot of expierience on a ttr125 and some on a yz250 and i did ok on the 250 it was a little to tall for me and i do trail riding. whats your opinion of me riding a CRF450R maybe with a flywheel weight do ya think i could handle it or what?

i didnt handle the yz250 to well cuz it was a little to tall i think i could of handled it better if it was shorter like the CRF450R it has about 37inches from ground to seat the yz is around 39 and the yz i rode was modified for a taller rider so that didnt really help much but overall i did ok on the yz just couldnt go wide open all the time on it like my TTR125 hahaha.i think im just gonna have to ride the CRF450R and see for myself.i will most likely end up with a 250 4 stroke somthing lol i have no clue what brand though suzukis bike is the shortest nd i like the smaller bikes betr but it overheats like a mother Fr and the yamaha yz250f is too tall and the honda crf250r is short with a good engine but i dont know about the crf250x that joker is expensive ill have t look at more then just the price tag next time i look at it