I have upper teeth higher and gaps.

Definitely braces are the ideal treatment options for such cases. And the treatment duration advised to you is also right because the maximum force applied to move the Teeth cannot be exceeded beyond the limit and that is why it is a slow and steady process. The treatment cost is also quite nominal. We now have other treatment options also which can be used to correct such problems in a shorter duration of time although the expenses might be slightly higher. The best treatment options suited for your case can be delineated only after a proper clinical evaluation of the case for which we need to visit a dentist. The treatment options can vary from laminates to even metal free Zirconia Crowns. But all these are tentative suggestions without a look at the clinical condition of the teeth and only going by the verbal description that you have mentioned. Alternatively you can post the clinical pictures on Practo for an online consultation with the specialist. Regards.