Jesus knew that when He left, the disciples would need to be comforted and strengthened. He said in John 14:16-17, "And I will pray the Father, and he shall give you another Comforter, that he may be with you forever, even the Spirit of truth: whom the world cannot receive; for it beholdeth him not, neither knoweth him: ye know him; for he abideth with you, and shall be in you." When we feel like we are the Lone Ranger...God has given us Tonto in the Holy Spirit. The Holy Spirit leads us into all truth, He is our Comforter, He is our friend...someone who will be with us forever, and it is He who gives us the power and strength we need to get through every day.
If you need a friend...know that Jesus has sent the Comforter...to not only be your friend, but to endue you with power that will have an impact for the Kingdom. Lean on Him. There are some days I have to remind even myself of this when there's no one else to lean on. I need to lean on Him.