I'm freaking out cuz they found my blood pressure high at my gyno yesterday and I'm only 24 yrs old should I go to the er?

No. See your primary care doctor and recheck it a couple of times several weeks apart. If it's truly high, he/she can discuss with you about ways to lower it with and without medications.
Probably not. Apprehension and fear drive blood pressures up when seeing doctors (nb: "freaking out"). Follow BP away from the office. If still persistently elevated, there are causes that occur in young patients (blood vessel and hormonal issues your doctor can explain) that can be sorted out. Ambulatory blood pressure monitoring for 24 hours will often clear this up. Regardless, high bp's easily managed.