Hi Pia, I understand what you are saying. I'm 28 and I often feel the same, that I haven't excelled or accomplished anything, that I don't fit in anywhere. I think that by talking to God more, and especially spending time praying for other people can really help. I recommend that you take authority over any lies the enemy is telling you, and to claim God's truth. He created you for such a time as this. I pray that God would bring you into His purpose, in His timing. God bless!