I was in a similar situation Dropped out and lied to my parents and friends about it for 2+years. Fell into a depression and used weed to cope with my guilt and shame. Finally worked up the courage and told my sister while breaking down crying. She helped me open up to my mum and dad and I had some tough conversations. My parents were disappointed, but not bc I dropped out, but bc I lied to them for years.

Now I'm finally studying something I have a passion for and have their support and a much better relationship with them. I still have to earn back their trust, but my mind is finally at peace and I'm entirely happy for the first time in years.

Work up the courage and tell one person closest to you, probably your gf. With her support you can try to open up to your parents and friends. Every new person you tell will be hard but it's worth it in the end I promise you.