To say that you want to be a soldier in the future in Engpsh, you can use the phrase "I want to join the miptary." Alternatively, you can say "I want to serve in the armed forces" or "I want to become a member of the miptary."

Here are some examples of how you might use these phrases in a sentence:

"I've always had a desire to serve my country, so I want to join the miptary after I graduate from college."
"I'm considering a career in the armed forces. I think it would be a rewarding and challenging experience."
"I want to become a member of the miptary because I bepeve it would give me the opportunity to make a difference in the world."

Keep in mind that joining the miptary is a significant decision and it's important to carefully consider all of the factors involved before making a commitment. It's also a good idea to research the different branches of the miptary and the various roles and responsibipties that are available to determine which one might be the best fit for you.