Totally normal!!1
When i was 18 and my D#$%% would get hard from a strong wind and or stay hard with 18 beers in me I could still lose my erection with condoms.
Agreed with outhers to practice solo...The other thing i found helpful is to make sure your partner is good an lubed before hand so you woun't struggle at the point of entery and loose the erection there. If there is not unough natural lubricant get the lubricated kind.
When i was 18 and my D#$%% would get hard from a strong wind and or stay hard with 18 beers in me I could still lose my erection with condoms.
Agreed with outhers to practice solo...The other thing i found helpful is to make sure your partner is good an lubed before hand so you woun't struggle at the point of entery and loose the erection there. If there is not unough natural lubricant get the lubricated kind.