Translation: I don't believe things that have no evidence to support their existence exist.
These two statements can either be supported by evidence or they can't. No amount of hand waving can replace evidence.
No, you haven't ever been at any time that wasn't the present from your perspective; No, that doesn't mean that other parts of time don't exist.
Having no evidence to support the existence of the past makes thinking it exists illogical. It is illogical to think that things with no evidence to support their existence exist.
No, you haven't ever lived surrounded by hard vacuum; No, that doesn't mean that a vacuum doesn't exist in nature (in fact, most of the universe is a hard vacuum).
If there is evidence to support the fact that most of the universe is a hard vacuum then thinking it is would be a logical belief.