It's a new chapter in your journey through life and you just need to take it slow, listen to your body, and use common sense. You are young and have your whole life in front of you so don't try to push the envelope. I had takedown in my 20s as well and sometimes younger people think they are indestructible. Most of my errors were in being too aggressive especially in my diet. Just take it slow and build yourself up over time, both in diet and activity. Good luck!