Join the Military?

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So I've been thinking about join the Army. I've always been interested in the history of militaries and sort of always admired soldiers and warriors n such. I love guns, I love the tactical side of it, and I want to do something that's greater than myself. I'm thinking of joining the infantry.

The only thing is, I'm pretty scared. I'm scared to just give away 4 years or more of my life if I realize, after I join, that the military is not right for me. I know it's a risk, and it seems like an exciting risk, but scary too.

How do I get over that fear? How do I get that motivation to just do it? How do I know I won't be wasting years of my life that I'll never get back? I'm on the border of wanting to join and not wanting to join. I sort of want to be convinced to join.

So /k/ can you convince me?