Philippians 4:4-7 "Rejoice in the Lord always; again I will say, rejoice. Let your reasonableness be known to everyone. The Lord is at hand; do not be anxious about anything, but in everything by prayer and supplication with thanksgiving let your requests be made known to God. And the peace of God, which surpasses all understanding, will guard your hearts and your minds in Christ Jesus."
Stress can be a very good thing. Our body has natural functions that alert us when something is wrong. However we often let this stress absolutely take over our whole system. We worry when things go wrong, and many times there are good reasons: maybe you aren't able to make ends meet this month with the bills, maybe you or someone close to you are going through a lot of health issues. Maybe you're having a hard time balancing life, school, work, etc.
In all of these things, our first response should be to go to prayer. We have a resource of strength, wisdom, and peace that no human, currency, or object can provide. Take advantage of this free benefit that comes with your free-salvation gift!
Our response to stress is a good indicator of where we are in terms of patience and our temper. If you respond well to a stressful situation (someone cuts you off on the road, a you've been insulted by someone you are close to, etc.), that is great! Keep giving your worries to the Lord, and he will work through the issues you face.
If an issue presents itself and you react with anger, frustration, or any other form of lashing out, really try to calm yourself enough to talk to God. Every person has reacted in this way at some point or another, so don't be afraid to talk to a mentor and ask for prayer and encouragement.
Go to God with your prayers and he will provide you peace!