A huge problem waiting to happen... What should I do?

Okay this is kinda long, but please read: When I was 12 (I'm 14 now), I used to scratch my legs with any random thing I found... but it was always one scratch at a time, and looked pretty normal. .Lately I've been having some 'problems' (anxiety. starting high school, being really unpopular, my mom keeps telling me I'm worthless and I'll end up living in her basement forever, etc.) My dad happened to buy one of those enormous nasty hooked dental tools. I stole it sharpened the edge and started cutting myself on the ankles with it... and scissors and nail clippers and a knife (but I only did that once and it got infected)I try not to do it too deeply, but I have like 20 cuts on my left ankle, and they're really non-natural looking straight lines, and it leaves scars. Right now its winter and I wear socks, but those cuts are a nasty problem waiting to happen... Eventually I'm gonna have to go to a party in a short skirt, or swim for school P.E. I already look like a total freak wearing sweat pants in gym when everyone else tries to show off their butt. When I was 12, my mom eventually caught on that i was making the scratches on my legs myself, and she just said that I was an idiot and good thing I wasn't smart enough to actually cut myself and if I start slashing my wrists she won't care. But she did act really suspicious of me for a while. When I started doing it again, I thought it was a one time thing, no stretch to hide. But the pain makes me feel better, and I can't stop, and even though it's not on my wrists I can't hide it forever! Sorry this has turned into such a long rant, but eventually I'll have to show my legs and I'm really scared about what will happen. What should I do?!
--------------------
I'm so sorry. I feel like were related or something. Your moms a ***** like mine. Try Mederma for your scars... read the directions and they will fade if you keep it up. You could also try just a mineral powder or concealer over them. For the cutting part, I know this is hard but just really try not to do it. What I do is scratch with just my fingernails in places where no one has to see them. High school is probably the worst place you will be in your life. Trust me, people in school are just a bunch of empty people and your lucky to not be one of them.
Source