My best friend is irritating me lately?

Me and my best friend have been friends for 4 years. She is a very important person to me and is always there when I need help or I'm sad. Lately I've been more happy in life and began hanging out with other people as its my last year in high school. My best friend prefers to be alone and stays to herself. She gets jealous very easy and is scared we aren't going to stay friends. She is also very bossy now and days and it gets on my nerves. I used to want to hang out with her 24/7 but recently it's the last thing I want to do. She is also wayyy too straight foreward. She tells me things like "My tattoos look bad." or just stuff like that. It's been bothering me and I'm always in a bad mood when we are around eachother. She also wants me to change my schedule for my last semester so we can be in the same class but I don't want to do that either. I love her so much but she just makes me upset. Please give me advice about this. Thank you.