My heart rate skyrockets when I exercise. Today I did jumping jacks for only a minute and my rate was at 180. Is that really bad? I'm 23 years old

Out of shape. You need to start doing regular exercise- whatever you like--walking, running, swimming, aerobics etc- at least 30 minutes a day. Then you can increase it gradually. The situation like you described is very common to happen when you are out of shape and your body is not well trained/maintained. Don't be discouraged- instead use it as a motivation.