My feelings of love for my longest time best friend and the dilemma I have about it

I shall begin with with myself for I know not how else to. My name is Charlotte I am only 16 years of age and trans mtf. My friend i shall refer to as L1 they are like me 16 aswell. Let me begin at the start i met my friend online only one year ago and we had talked on and off for a while but then we started talking more frequently and I grew feelings at first it was only as friends but I found myself lost in thought about L1 my thoughts of chatting with them and being there with them in real life were very common. I had told them my feelings about them and L1 told me that it wont affect our friendship and it didn’t. L1 was already in a relationship so i knew nothing was going to happen so i simply ignored my feelings and i ended up in a new relationship that started great but alas he grew distant and I felt unloved and realized I only am really into girls so i broke off the relationship and L1 had ended theirs. Unfortunately L1 had decided to leave the internet but we still had connections and they recently started talking with me again. Now over the year my feelings for L1 only grew and the thoughts of them only became stronger my thoughts have become more romantic and every day i think of them as i do my things i often day dream of L1 as i and work and listen to music. I want to tell them how much they mean to me but i have fear for as i have been single i have been taking too another person and they’re into me and i do like them i am not ready for anything more than friendship right now for anyone but i know not how to say that i love another more and want to be with L1. 

My apologies for any confusion words are not my strong suit I just love L1 so greatly i love them like the sunflower loves the sun as the sky loves the earth as peanut butter loves jelly. I would sacrifice everything for L1 

I don’t know how to express myself and my heart aches for them