How can i identify if i suffer from any mental desease or disorder? (e.g. anxiety, depression..)

Start with some: general questions. Do you have anxiety, moods that are too high or low? Do you avoid dealing with life's stresses? Do you drink or smoke or do other drugs to the point of causing problems? How are your relationships? Functional? Or, do you have a string of failures or fight too much with your partner? These are are all areas that provide hints. Take this info to a mental health pro..

EVAL: Get a psychiatric evaluation for the symptomology that bothers you, and consider possible medication management. Then get a referral to a reputable clinician who specializes in whatever your issues may be.