It's natural to be a little nervous about something you haven't done before, but there is absolutely NO need to be 'scared' of going through the airport alone. Hundreds of others will be doing it for the first time too, but you won't know it, and they won't know you are either.
If you allow PLENTY of time, and if you can read and speak, there will be NO situation that you can't handle.
At every stage, ASK 'Where do I go next?' - and GO there! Airports are clearly signposted, but if you get confused, you can ASK.