Is There a Doubt About My Baptism?

Some people have a doubt about their baptism. The ideao what i want to start all over again, and that's what Baptism is - we could renew our baptismal vows, but we are not re baptized. People think i was baptized, but they honestly don't remember. I just don't know. That's what we have if we call a conditional baptism. We don't look for trouble unless there is serious doubt.