Having big trouble being under pressure

as title says...this is really putting me off :mad: When on pads my technique and power is pretty good, when i spar against more experienced guys at the gym that i know i am usually quite technical and do pretty well, even when we go hard at sparing i always feel comfortable and even if im getting wacked i try to carry on strong. But whenever it comes to spar with some one new who goes wild and don't really care about being technical, some one who windmilling and just puts a lot of pressure on me, all my technique goes down the toilet...my punches and kicks become very sloppy and I just go into defensive mod and trying to step back from every punch. I know exactly what i need to do in that situation... fire back, clinch, low kick, push kick etc... but i just cant do any of it when i am under big pressure.



Can you guys maybe give me some advice on how to overcome this problem please



cheers