I am sorry to hear you find fellow sikhs do not accept you. The truth is even within the sikh community there is even prejudices against different casts STILL. All these prejudices were dispelled by the gurus, and Sikhism as I understand it accepts all faiths that beleive in one God. All faiths that I know of that beleive in one God also dispell such prejudcies. What I am tryng to say is that it is the people who are weak that seem to have a problem with accepting you, in that they are not following the teachings of our religion.
Therefore take no notice of them. You carry on findng fulfillment following the teaching of our Gurus.