Does "pursuing concessions" and my acts of worship being unacceptable—especially the obligatory prayer—apply to me if I resolve to take advantage of the concession of combining and shortening prayers during travel—without scrutinizing the distance of travel or whether it is conventionally considered travel—in order to alleviate rigidity in worship, knowing that I suffer from obsessive doubt (waswasa) and tend to adopt the stricter opinion in matters of scholarly dispute?

There is no doubt that caution in religious matters and acting according to an opinion that avoids scholarly disagreement is commendable, especially if the disagreement is strong and the evidence is equally balanced. However, one must maintain moderation and avoid extremism or falling into obsessive doubts. Regarding the issue of shortening (qasr) and combining (jam') prayers during travel, it is particularly important to adopt the more cautious approach for someone who has not found a preferred opinion, because the majority of scholars consider shortening a Sunnah and combining a concession. If you shorten and combine prayers for a distance not considered travel by the majority, your prayer would be invalid according to them. However, if you pray in full, your prayer is valid according to everyone. It is not permissible to avail oneself of travel concessions without fulfilling the recognized conditions. If you believe the opinion considering custom (ʿurf) to be more sound and you are qualified to weigh opinions, or you follow someone who issues fatwas based on that, then you may adopt it, provided that the distance is genuinely considered travel by custom. Otherwise, you revert to the distance recognized by the majority. Your embarrassment from differing with the congregation is not an excuse that permits you to avail yourself of concessions without fulfilling their conditions.