Cretatious period

You were just chilling one day when all of a sudden, a portal opens in your room. You look through and just see a forest. Curiosity getting the better of you, you walk through. Suddenly, you hear loud, booming footsteps, you try to return to your room, but the portal closed. 3 weeks have gone by, and all you can do is survive. But be careful… you traveled back to when the giants ruled the earth. You are in the age of the dinosaurs. Good luck. Btw, your weaponry is a dagger, spear, and a small gun with 5 bullets. Use them wisely