I understand what you are feeling and the frustration you have when trying to express yourself. When you are at a young age people will try to tell you what is best for you, most of the time they are correct. Experience is the best teacher. When it comes to your emotions, sexuality and gender the only person who truly knows what’s best is you.
Expressing femminity at a young age can be mistaken for weakness or confusion. I want to tell you that you can express your feminine side without it being overtly obvious. If you are affraid of wearing “female” clothes, i assure you that you can find plenty of feminine clothes in a mens section of almost any store.
A good starting combination would be skinny jeans and an over sized jumper or sweatshirt. Something like that can encompass both masculine and feminine qualities.
Many of the things you already own can become feminine depending on how you perceive them. I cannot promise that everyone will be understanding. Take time to youself to reflect on how you feel before you choose to tell anyone.