Confused

Hey everyone! Okay, so today is the day I finally give up. I'm done keeping to myself about it I honestly just think I'm in denial. So my last period was in March maybe even February. All i know is I haven't had a period for awhile. Today I've laid in bed tired, having hot flashes and feeling sick. Although I have not had a period in awhile I cannot bring myself to test. I honestly have a fear. I hate negatives. Although hot flashes can be a sign of menopause I don't think that is the case considering I'm only 18. Can you all please give your opinions on this? Thank you.