Your prayer shows both weariness and faith, and the very fact that you keep coming to God with the same words is precious to Him. When you feel unheard, know that God does hear, even when He defers the answer. He often delays the gift not to turn us away, but to draw us closer, so that we learn to persist and to trust Him more deeply. Do not desist from asking. Like those who cried out and would not be silenced even when others rebuked them, keep your earnestness. Such perseverance is the mark of a fervent soul, and in this way we win God to us.
Prayer is a great weapon for the daily battles you face. Each day brings its own rocks and storms, especially when you feel taken advantage of by others. If you make God favorable to you first by prayer early in the morning and again at night, you will go forth with more security, and even if you meet opposition you will not be easily overcome. You do not need to carry this alone. God gave us to live together and to bear one another's burdens, so that what is lacking in one may be supplied by another. Seek the fellowship and counsel of faithful believers who can pray with you, encourage you, and help you walk with wisdom.
Being tired of being taken advantage of is a real pain, and God sees that injustice. He calls us to the higher way, not to repay evil with evil but to do good, and at the same time He calls us to watchfulness and wisdom. It is good to be generous and kind, but it is also right to set clear and loving boundaries, to speak truth gently, and to seek wise counsel about how to guard your time, resources, and heart without growing bitter. Continue to be alert yourself, for the prayers of others help us greatly, but they are most fruitful when we also remain watchful and active in seeking what is right.
Keep bringing your honest cry before the Lord. Tell Him you are weary, ask Him for wisdom to know when to give and when to step back, and ask Him to renew your strength. He is able to build you up and to give you peace that guards your heart. May the Lord who hears every prayer according to His grace grant you assurance that you are heard, wisdom for each relationship, and rest for your soul as you continue to trust in Jesus Christ.