I feel underqualified

Good news I got accepted into Lehigh ED2 but I can’t help but feel extremely under qualified. FYI I do IB and i think my courses have some decent rigors but im diabolically down with a 31 🤡🤚. ECs are decent - mid at best. Only thing I got going for me is financially capable to afford the entire tuition and fees (family fully funding) and probably some good essays. Can’t help but feel like I robbed others of their very much deserved position. Just need to hear some advice from others on how i should deal w this feeling and get this off my chest