我决定，一定要学好英文，我行的....我相信自己一定行的。。。帮我翻译英文 谢谢你

I have decided, that I must study English well, I can do it. I believe I can do it!

I decide to study English well, I can, I belive myself I can do it

这种东西要翻译的口语化 像是日记一样！

I promise， I gonna learn English hard, ---
trust me, I can make it!