How do I have my self-esteem back?

I'm basically older than my classmates for a year or two; I feel so stupid, dumb, and embarrassed that I'm older than everyone. I'm currently stuck at 8th grade and I'm supposed to be in my freshmen year but due to some circumstances I missed an entire school year. I feel so depressed and at times I find myself cutting my wrists and thighs.I feel like no matter what I do I'm stupid and a failure. No amount of achievement would make me happy as I was an A+ student at most of my school life but now it's all gone. I feel so dumb and I feel like I should know better because I'm older than everyone. I'm so embarrassed that my former classmates and friends are a year ahead of me even though some of them take their studies for granted and have failing grades while here I am, dying to be in their place. The gods witnessed how I tried everything I could to catch up but it just wasn't enough. How do I feel okay about myself again?

It does not matter that your older man buddy Just Be Brave with strongest person i hope you will be a super student if you try your best if anyone irritating you so ignore them just focus on study you want to ignore all the things you have to do this buddy you can't ignore study .. so please just focus on study.. Little bit i can't understand your problem but if your problem is sex so you should marry with a girl. You have to find your love.

I don't know why you missed a year of school, but there are very few humans on this earth who could cram that much knowledge in their heads in a couple months. So don't beat yourself up about that. Also, being one of the older kids in class is going to come in handy in a couple years, trust me. First one to be able to get a job, a drivers license, a car! You don't think some kids are going to be envious? There was a girl in my class in high school who was a year older and none of us looked at her as stupid, it was jealousy that she got to do those things. I know this all seems like it's the entire world to you right now, but trust me, please, there is a whole world out there and in a short time this won't seem like such a huge thing. Please do talk to someone you trust about cutting yourself and seeing a counselor. If it's hard to talk to your parents maybe the school counselor? As far as what anyone thinks of you at this moment, one it doesn't matter, what does is how you view yourself. And I promise the kids that have moved up a grade have their own insecurities and things that get them down too, and they won't be noticing you being a year behind for very long. Be young, find your happiness. Get help if it feels like too much. We all have our struggles every one is you are not alone!