The tradition of walking up for a blessing with your arms crossed during Communion is a protestant tradition, I believe it’s an Anglican / Episcopalian tradition. It’s not a Catholic tradition really. I was unable to receive for more than a year, and so I sat in the pew alone while the majority of folks would walk up and receive. For me it was somewhat humiliating, and I felt better to not go up for a blessing, but instead kneel through the Communion service and make a continuous Spiritual Communion. This prayer of St. Francis is a beautiful one to say: “I believe that you, O Jesus, are in the most holy Sacrament. I love you and desire you. Come into my heart. I embrace you. O, never leave me. May the burning and most sweet power of your love, O Lord Jesus Christ, I beseech you, absorb my mind that I may die through love of your love, who were graciously pleased to die through love of my love.” Or, I would also repeat again and again, “Lord I am not worthy to receive you, but only say the word and my soul shall be healed.”
I was told by a cyberpal that I could walk up with my arms crossed and receive a blessing instead of sitting there like a big fat sinner, but I feel I gained more by humiliating myself and taking the time for prayers of reconcilliation and spiritual communion, than I would have by walking up and asking for a blessing. That’s just me though, I have waaaaaaaay too much pride, so it was probably best for me that way! You are receiving graces from God just by being in mass, so you don’t really need to feel like you have to go up for an additional blessing from a priest. There’s nothing wrong with doing so, I’m sure it’s a good thing, but you don’t have to feel like you’re missing out if you don’t walk up there. Ask Christ to come into your heart and soul, He will, just ask!