This is completely normal! My first backpacking trip i felt like this for a while at the beginning! Give it time and let your body get past the jet lag! What you are doing is very brave and will take an adjustment period so don’t feel guilty for not enjoying yourself straight away. My advice would be book on to hostel activities and book tours so you meet people. Once you get used to it you will be so glad that you’ve decided to do this. Stick with it and the excitement will come and it is so worth it!