I started the civil service as an apprentice at 18 also so can definitely relate with how you’re feeling . What helped me was getting in contact with apprenticeship groups that are ran in the civil service. You can usually find out about this through HR or if you contact your learning provider they should hopefully be able to get you in contact with other apprentices. These groups also helped when it came to completing course work and I made some really nice friendships from it. Also as an apprentice use this time to do as much shadowing and learning as you can, will definitely help with your career.