Think your decision through. Involve your parents. Decide why you want to join, what you want out of it and what your goals are for the short term and the long term.
I enlisted for 3 years in 1969 mainly for the GI bill. My parent could not afford to send me to college and this was the best method I could think of. Also, I was under the influence of Robin Moore, Barry Sadler, and John Wayne at the time. I joined for 3 and stayed for 33. About 12 years of that was with the National Guard. All a great time. There were ups and downs. Would not trade the experience (and retirement ) for anything. I joined the army. You should look at all the services and see what they offer in the areas you are interested in. Look to the future. I didn't. Not much demand for my skills in the civilian market. Besides, I'm a little broke up. Still not complaining though. It is what I wanted to do.
Good luck to you and make the best of your decision.