The difference is they are all different verb tenses. You should know all six verb tenses, when they are required, and what they mean. - I have my own (present perfect) - I had my own (past perfect) - I did my own (past) - I do my own (present) Never use "wanna". That is not a proper English word. Use "want to" instead. => I want to put my XXX on exhibition.

Have- present/possession Had- past/possession For example, I have a pet currently vs. I had a pet in the past Do- action/present Did- action/past For example, what do you DO in your free time? Also, sometimes is one word. I hope I helped!