Hi there – western Europe is a region setup for backpackers – plenty of hostels, euro rail passes, easy to meet other travelers. I think you would be fine traveling alone – and who knows, you probably will meet someone on your trip and end up traveling a bit with them. Trust your gut – if some place or someone doesn’t feel safe, get out of that situation as quickly as possible. There’s always those trying to scam people they feel don’t have experience with traveling.
~ Dave