I have a girl that I have a crush on?

I am sixteen but I am stuck in middle school and junior high because I was held back four times. I am almost old enough to drop out but I am getting my grades up. I am 4 11 and I even look like a sixth grader. I have spent most of my life at this school and it is an elementary school too and it goes up to eighth grade. I have a crush on this one girl who is in the eighth grade and she is about fourteen. And I had a crush on her and she gives me a wink and whenever she looks at me her face blushes and it is very red. It looked like a heart. And she is new to my school and all she heard stuff was about me and that I was sixteen. I got the tingling feeling that she may not think I was intelligent and only likes smart boys and may not talk to me. I am older than her but like two years and Sean Logan keeps trying to tell me not to bother her and it always turns into a conflict between me and him. He raised his fist as if he were about to punch me and I am always getting frightened of him. And a seventh grader was hanging out with the girl and he would hurt the boy later and he hurt him like I never seen before. So the principal asked me to show the new girl around so I did and introduced her to my friends. I saw Sean in the field watching and I saw him scowling and glaring. So I gave him the middle finger and he held and shook his fist at me. So I glared at him and stuck my tongue at him and at lunch one boy said that the new girl liked me and he also tried to warn me about Sean. The boy told me that Sean was going to beat me up after school. I looked at my watch and it was time to go and the bell rang then I was nervous so I hurried out the door to the bus. Then I figured out that Sean transferred to my bus also and he got on the bus and sat next to me thumping me on the head. He was teasing me about my size and how I was going to make it up to 6 foot and he teased me about the worst thing my knowledge. It was then that I pushed Sean out of the seat and the bus driver made him sit behind me. The new girl was watching and she thought I was the violent type and she did not talk to me ever. The next morning I got on the bus Sean had lip stick and he took the cap off of it and held it forward about to put some on my neck. I licked my finger and ran it down the bus driver's neck and he turned around seeing Sean with the lip stick and he escorted to write him a referral. The girl now tells me to leave her alone when I talk to her. She called me violent and I said I am not violent I am only the defensive type not the violent type.