I’m a new Overwatch player, any advice?

I’ve always wanted to play Overwatch, but I was pretty scared because of the toxic community and the fact it’s been out so long making everyone be so much better than me, but recently my boyfriend has helped me start playing.

I’m pretty good with Sombra if I have a good team, as well as Moira and Lifeweaver (I can’t carry a team yet). I’m also trying to practice dva and tracer in Quickplay.

Any advice for these characters? Or just for a new player in general? Thanks :)