Can I sing in tune?
Believe me, if you can't people will tell you!
There are far more people who think they can't sing in tune than there are people who actually can't! Most people are just being hyper-critical of themselves because they don't sound like their favorite singer when they record themselves on a cell phone!
Do you have any idea how much expensive gear, time and technical cheating goes into making them sound like that?
I could get most of you in my studio and make your voice sound fantastic when recorded.
Now, performing, that's a different thing. There's nowhere to hide there and consequently, guess what? None of them sound perfect. Performing is about entertaining the audience, not being technically perfect.
So yes, you most likely can sing in tune and just need some confidence to sing out a little louder and prove that to everyone.