It really depends on where you live. If abortion is legal where you live, then you only have to ask your doctor or, to find a clinic, put 'family planning' plus your city into a search engine. (You say you can't go to a clinic, but there is nothing else to do - please don't even think about trying to do anything by yourself as this is EXTREMELY dangerous. There must be some way you could get to a clinic.)
Otherwise, you could try to reach Marie Stopes International - I tried their website but couldn't reach the international section, however you could email them - or the
www.brook.org.uk Brook Centre, who could probalby advise you even though they are UK based. Also, if there are family complications here, ie you are afraid of the reaction from your family, again Brook may be able to tell you where you can get help. If you are taking this step out of fear of your family, do please see if there is any way to get help with this before you decide.
I wish you very good luck, whatever you decide to do - and remember, it is your body and your life.