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When i hit 70-80mph my car vibrates, kinda scary any know have an idea?

Could be alot of things...did you just get the car recently? Has it done this since day one or just started recently? Did you do any work on it or anymods? New tires/rims? Maybe lost a wheel weight? Axles? Ball-joints? Wheel-bearings?

...separated belt in a tire, mud in a wheel, incorrect tire pressures, broken spring, bent tie rod end...the list goes on and on.

There are an almost infinite list of things that can cause a vibration. If you don't know what to look for you should be taking it to a professional.

i have the car for a while now and first time really driving it on a high way like that but io guess theres to much to tell

If the tires are still good, I'd start with a road force balance. Regular balancing usually isn't good enough for today's lower profiles and larger diameters. It took me 5 tries to get my new F150's Bridgestone Revos balanced, and that still isn't perfect, especially at speeds above 70mph. Look specifically for a service shop that uses the Hunter GSP9700. I've also found that the car's shocks, which I believe are a combo of oil and gas(two chamber?), allow bouncing at higher speeds if they're very worn at all. Mine didn't bounce at all when I pushed on them while sitting, but when replaced the vibrating was much less. Tires are always my issue with all my vehicles. I'm not sure why, but they seem to be very finicky now.