As a separated or divorced Catholic, you are an important part of the Catholic Church and you are absolutely welcome in your parish:
The Church is extremely sensitive to the sorrow of her members: just as she rejoices with those who rejoice, she weeps with those who weep (cf. Rom 12:15).
As the Holy Father clearly stressed in his address to us during our plenary assembly: “Let these men and women know that the Church loves them, that she is not far from them and suffers because of their situation. The divorced and remarried are and remain her members, because they have received Baptism and retain their Christian faith” (Address to the Pontifical Council for the Family, 24 January 1997, n. 2; – L’Osservatore Romano – English edition, 5 February 1997, p. 4).
Taken from: L’Osservatore Romano, Weekly Edition in English, 6 March 1997. L’Osservatore Romano is the newspaper of the Holy See.