Singing techniques & advice

[non3ko]

I need some tips and pointers when it comes to singing. I have an average talking voice--not sure if that has anything to do with singing. I don't have a problem singing songs of a higher pitch, but when it comes to singing at a lower pitch my voice sometimes cuts off. :/ The only way I can go deep is if I talk-sing and it doesn't sound right. When I try to sing lower it's not strong, instead it's light and like a whisper. When I yell or try to resonate my voice, I sound like a little girl because it comes out high pitched. How do I sing lower notes stronger? Surreal is a song I've always had a problem with because it's so low, and I sound off pitch--I'm not even sure what key she's singing in. Songs that require power like Duty are hard for me to sing, versus something like Hanabi which is soft. Is it because I don't have a powerful voice? Also, how do I open my voice up more, because I notice I strain and sing with a tight throat. I'm not familiar with musical terms, so this is hard for me to explain...