Saddle soreness/blister/scratch and 'frozen shoulder'- is this common for first-timers??

a week ago, i've been on my 2nd bike ride in 10yrs and this time did an 18-mile trip mainly on road+smooth country terrain, but noticed 1/2 way thru' i was getting very sore in my crotch area +found myself having to sit off my saddle occionally in order for the pain to be lessened. the frozen shoulder came and went throughout the journey.thankfully, i made it home in 1 piece,but noticed i was extremely tired but found the leg ache too much to bear that i couldn't sleep well that night. in the morning i was suffering with severe muscle pain which i managed to sort out with some deep heat type of lotion,but worringly my crotch area (only 1 sore)became inflammed and blistered with 2 small scratches on it. i wonder if any of you keen cyclists ever heard of this before+whether this is common for those unused to this type of experience.it's been 6 days since this occured but the sore has been healing quite well with only the scratches visible.btw, i am female w a man's MTB/carrera.