depression& tension for friends

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i am studying. i have this problem from 9th standard.i am guy who takes precaution everywhere.i make friends. i want to trust them. when i first meet them they try to show interesst in me and help me & trust me. but after few momnths they try to hide things &i lose trust in them. then they try to use me for their works i later come to know that i was used when they start refusing to help me . i help them thinking that they r my frends. but they cheat me &leave me alone after showing great care &make me depend on them .what should i do ? i got helpless &get tensed &cost is paid by my studies.how should i tackle it ? this happens mainly aftwr they get all study material or help from me.