The most annoying grammatical mistakes were the frequent misuses of old English, like thine and thou.
Other than that, you also see words that have been replaced with incorrect homophones. The poems are also riddled with an abundance of incorrect sentence structure, typos, and incorrect punctuation.
Not that I'm trying to dissuade you from writing or anything. In fact, you should try to write more so as to get over your grammar issues.
In order to add some constructiveness to my criticism, I'll quote your poems and fix their mistakes later.