I grew up with a girl who was part of the gang as it were. Sometimes called Tomboys, after a tomcat. Many girls are not traditionally feminine and these days things like football and soccer is played by more girls. More girls work i what were considered traditional male jobs also.
The girl I knew and still know was not 'feminine' in the sense that she always dressed in jeans, and a top similar to what boys would wear. She never used make up but when I was young (30 years ago) many girls would not wear make up until they were 18 or so.
This girl did not look feminine, but one day she wore a dress, put on a simple bit of make up, combed her hair, and emerged as VERY feminine.
As for your sexuality, I knew a girl who also had a lesbian relationship and then later on got married. She may be bisexual but fell in love with some man and as far as I know lived happily ever after. Which is great.
She also dressed more in casual attire. I never saw her in a dress but always wondered what she would look like. She was not confident about her body so this was part of the reason. She wore a dress, I missed that occasion, but she looked so different that I would have been stunned.
Maybe you've dressed casually and in some lesbian circles, there is the political argument that women dressing for men is wrong. Women once burnt bras, but in the scheme of things some ladies bless the bra as it does offer support and comfort. And sure, it looks nice also.
If your bisexual the same rules about attraction apply.
Take a nice shower, maybe get your hair styled or ask a friend what style may be best and buy some home kit.
Wear a dress, shower and wash your hair - a dab of perfume, a touch of make up and you would likely be transformed so that some man, your own age, who may not have noticed you will notice you now!
Femininity is also expressed in a myriad of ways apart from how you look.
I'm sure your own self image of yourself is way off the mark and you ought to know that we do not judge a book by its cover.
you say that not many people have complimented you - but some have said you are nice. Is that not a compliment? Plus, if you've never really been one for making much of an effort in dressing up, maybe if you do then you'll find compliments.
I mean, you cannot expect people to say you look nice if your wearing a tracksuit or maybe leggings and a t-shirt.
All you need is one person to think you look beautiful to actually start to believe it. Hopefully you'll meet someone nice - because nobody wants to end up someone not nice.
Nice is part of the deal for most sane men or women. If you do not look like Miss World, that's OK because most men likely wish they were more masculine in some way. Square chins, bigger biceps, and so on.
Anyhow, I hope you can feel more at ease and hope you end up with someone nice who might be able to persuade you that of the almost 7 billion people on this planet, you're the one.
This happens everyday, so hold on in there and don't be afraid to dress nicely.
Sometimes depression can make you dress down or play down your sexuality. You also face the worry over sexuality but I've known women like you and they ended up fine. One married to a man, the other living with a women for many years now. Both happy.
Good luck and God Bless.