Please help (gslt) !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!…

ever since i was growing up i knew i was straight! i really only liked guys and i am a girl btw. And when i was in 8th grade i started to think about my sexuality. i even liked a guy when i was thinking about it. I kept on thinking i was homo or gay or bi and ii got soo paranoid about my sexuality! iis there any chance i can be gay? i never likd a girl and a couiple months ago i REALLY LOVED this guy . could i b bi? i never liked a girl but i keep thnking i liek girls when i am around them because i am so paranoid. before all this paranoid stuff happend i never even considered girls as anything but friends . can u please help me ! what do i do to stop being paranoid. Am i straight? can a FULLY straight person turn a different sexuality later on in lifee