Its easy to understand how it could be embarrassing for you and I can understand why you would not want people to know what has been going on.
Bandages could help, like mentioned above, but might also look suspicious. Another thing that I have heard of people doing in the past is using a bit of oil, of some description, and applying these to the scars and then wash off in the morning - it takes a bit of time but apparently the scars begin to fade.
I have had a friend who for a long time all she would do was wear long sleeves, even in the heat of the middle of summer but eventually we realised she was not herself and talked to her about everything that had been going on. She did not want to talk and hated me at the time for realising there was more going on and it took her a while to forgive me, but now, three years later, I am thankful she is still in my life and is one of my best friends.
The other solution I would have is to learn to love yourself more and be accepting of who you are and what you are going through, rather than continuing to cut and inflict pain upon yourself. Set goals for yourself of not cutting, but take this each day at a time, or set other types of goals so you have things to work towards.
