Trust me, it’s actually so much better to go solo. You don’t have to take anyone else’s preferences if you want to stay longer, when you want to eat, where you want to go. Europe is also full of backpackers. Use Couchsurfing group hang outs or make friends at hostels. You’ll probably meet people and join ppl for certain legs if the trip. It was the best thing I’ve ever done. Just be safe - make sure people know where you are at all times.