There are some real great practical suggestions here already, which is wonderful! I'll add that so much of how we feel about ourselves can really be influenced by how other people see and treat us, and we shouldn't underestimate that. It's so good that you've got good, supportive friends - asking them to gender you as femme as much as they can can really help and really shift how we think of ourselves, too.
Something that really helped me, too, that took me far too long to learn, was getting comfortable with just playing - with clothes, make-up, hair, anything gendered. We can take it all so seriously, because it's important to us, but that meant whenever I did something to my appearance and it didn't turn out exactly how I imagined I felt real stink about it. Actually thinking to myself "I'm just having a play with this and it doesn't matter if it doesn't turn out right" made a huge difference, and made it way easier for me to keep experimenting!