How Do I Act????????????????????????

I like acting but I always sound to boring. Like I get my lines out and my voice is good but it sounds kinda faky. And also for some reason after I say a line I say it the same every time I say it again. Also when I try to say my line loud my voice gets deeper and faker and less relaxed. When I just say it normal then I can put feelings into it. How do I get it better.