Listening to your stuff I can say you definitely can. You can sing in tune and have a very good tone and making music with your friends will only improve your skills.

Your voice is very good, you can definitely sing better than I do (almost everyone can), go for it mate.
I think you should really go for it, I mean, you definitely can pull off great performances, and as mp8andrade said, making music only will make you improve.

I really like your voice, the best wishes for you and your band! Hope you post more stuff here soon dude, I'll be waiting for it
Never Scoop Mids