Is quetiapine safe ? doc gave me for insomnia, i'm hesitant to taking cause read risk of blood clot, does benefit outweigh risk in my case ?

Generally safe: But, why do you have insomnia at 18 is a more important question. From your other meds, I infer you're being treated for depression +\- anxiety. Maximizing your sertraline may be the first step. If you're dealing with bipolar disorder, quetiapine can be a helpful mood stabilizer and augmentation to the antidepressant. I'd probably look to move you away from diazepam as it an interfere with memory