If you find that Christianity exhausts you, draining you of your energy, then you are practicing religion rather than enjoying a relationship. Jesus said that a relationship with Him would bring rest to your soul. Your walk with the Lord will not make you weary; it will invigorate you, restore your strength, and energize your life.
Hard work or lack of sleep can make you tired. This fatigue can usually be remedied by a good rest. But there is a deeper fatigue that goes beyond physical tiredness. There is an emotional exhaustion that comes from experiencing heavy burdens and draining crises. There is a tiredness deep within your soul that comes from carrying the weight of the needs of others. You can go on a vacation, but your soul will not be restored. This condition can only be rectified by finding rest in Christ.
Some zealous Christians want to do all they can to serve Christ, and they exhaust themselves in the process. It was to these that Jesus extended His invitation to go to Him and learn from Him. Jesus spent most of His earthly ministry surrounded by needy multitudes. He faced relentless opposition, He often prayed throughout the night, and He rarely had any privacy, yet He always received the rest and strength that came from His Father. It was not that Jesus did not work hard but that He knew the path to spiritual rest. Are you weary? Go to Jesus and let Him give you His rest. His rest will restore your soul as nothing else can.