Motivational letter for volunteering

Hi guys! Can you help me please with correcting grammatically my motivational letter? I'll love you forever!

Dear
I am writing this application as I am interested in volunteering for (xyz) and would love the opportunity to be able to help others. I have found your program in the (site) and I hope it is still activated. I am enclosing my CV with this letter for further informations.
I have experience working as a volunteer on various fields. For the first time I have the opportunity to help others when I was 13 years old, so I become a member of ‘School Caritas Club’, where we were helping others by raising food, clothes and money and teaching other kids about our activity. It inspired me and encourage to help other.
Whilst being a member of our school club I also became a volunteer in ‘xyz’- Association for children and their families in 2012. I was responsible for helping kids with homework and exams. As well I was giving classes on English for younger kids, teaching them basic knowledge. I also was helping with international exchange with pupils from USA and Asia.
Along with going to high school in 2013 I participated in in pilot program, volunteering for kids with siblings who have autism organised by Association ‘xyz’. I was visiting a girl, whose brother was autistic and we play together and had a lot of fun! The main purpose of this project was to provide the siblings feeling that they are also important and loved. It opened my eyes to a real problems witch people have to deal with on a daily basics.
Because of a lot of school duties and time-consuming profile of my class (biology, chemistry and physic at extended level) I had to gave up for a while my volunteering works but I was missing it a lot! Now, when the summer begun, I finally have more time and I would love to spent it by helping others.
I am aware of the fact that English isn’t my first language, but I have always loved this language as much as my native one. Currently I am at B2 level of English, by autumn my group in school will be taking C1 level classes. I also have a lot of opportunities to talk with English speaking people and I am always willing to do it.
I am eager to meet new challenges and find ways to improve myself by helping. I am ready to learn and I would be very grateful if you would give me a chance to contribute to this project
I thank you for your time and I hope for a positive response. If you have any questions, please contact me via e-mail (nnckndkncv@gma). I look forward to your reply.
Yours sincerely,

Thank you for your time!