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Learn how to use have, has, and had as auxiliary verbs and pronouns in English grammar. Find out when to use I have, I has, or I had with different pronouns and tenses.
The answer is far too long, and too advanced for a beginner whose question was "when I do I use "I" and "I have"? Clearly, the OP is not even aware of the structure Present Perfect. It would have been better to post a few links to previous questions on this site. There are literally hundreds of questions about PP. Hundreds. I mean just look at the tag selected by the OP: "have". How can you ...
Is there any textual usage difference between words like " I've " and " I have ", or is it just an accent thing? e.g. I've finished my homework. I have finished my homework. It's a beautiful day. It is a beautiful day.
Have - English Grammar Today - a reference to written and spoken English grammar and usage - Cambridge Dictionary
We have had a wonderful time. (In this example, "have" is an auxiliary verb, helping to form the present perfect tense, and "had" is the main verb in the form a past participle.
Learn when to use 'I have' and 'I've' as contractions for the verb 'have' in British and American English. See examples, usage notes, and references from grammar books and dictionaries.
Learn when to use have or has depending on the point of view, the subject, and the verb tense. Find out the exceptions, the modal verbs, and the collective terms with have or has.
Learn the difference between "I am having" and "I have" in English grammar. See examples of how to use them correctly and when to avoid them.
Learn how to use has and have correctly to show possession in different grammatical contexts. Has is used with singular subjects and have is used with plural subjects or first and second person pronouns.
Learn how to use the verb to have as a main verb, an auxiliary verb, and a modal verb. See the forms, meanings, examples, and questions of to have in different tenses and contexts.