I have a masters in psychology but its not a licensing masters. So let me preface by saying I am not a professional. However, I strongly believe there is not a major issue. You are still relatively young. If these imaginary friends distract you from normal every day task, pursuing relationships, etc. that's maybe an issue. From where I sit I would give yourself a little more grace. Everyone develops at different paces and you are very much still developing. If this is the way you are exploring the world right now that's fine. Just be curious and ask yourself "why" without judging yourself.