Bismihi ta'ala
It is permissible for you to recite supplications in English, if you wish. Of course, the ideal would be for you to recite them in their original language, as has been transmitted to us from the Ma'sumeen (a.s.), and memorising what you are able to. Along with this, you are able to look up the meanings, and the bonus for doing this is you are picking up wider vocabulary in Arabic language as well.
With prayers for your success.